diff --git a/web/app/components/base/quadrant-matrix/index.tsx b/web/app/components/base/quadrant-matrix/index.tsx
index 07114ecb1c..43fc68e6b6 100644
--- a/web/app/components/base/quadrant-matrix/index.tsx
+++ b/web/app/components/base/quadrant-matrix/index.tsx
@@ -1,7 +1,10 @@
 'use client'
 import type { FC } from 'react'
 import type { QuadrantData } from './types'
-import { useMemo } from 'react'
+import { RiExpandDiagonalLine } from '@remixicon/react'
+import { useCallback, useMemo, useState } from 'react'
+import ActionButton from '@/app/components/base/action-button'
+import FullScreenModal from '@/app/components/base/fullscreen-modal'
 import QuadrantCard from './quadrant-card'
 import { isValidQuadrantData, QUADRANT_CONFIGS } from './types'
 
@@ -10,6 +13,8 @@ type QuadrantMatrixProps = {
 }
 
 const QuadrantMatrix: FC<QuadrantMatrixProps> = ({ content }) => {
+  const [isExpanded, setIsExpanded] = useState(false)
+
   const parsedData = useMemo<QuadrantData | null>(() => {
     try {
       const trimmed = content.trim()
@@ -25,6 +30,14 @@ const QuadrantMatrix: FC<QuadrantMatrixProps> = ({ content }) => {
     }
   }, [content])
 
+  const handleExpand = useCallback(() => {
+    setIsExpanded(true)
+  }, [])
+
+  const handleClose = useCallback(() => {
+    setIsExpanded(false)
+  }, [])
+
   if (!parsedData) {
     return (
       <div className="flex items-center justify-center rounded-xl bg-components-panel-bg-blur p-8">
@@ -44,94 +57,120 @@ const QuadrantMatrix: FC<QuadrantMatrixProps> = ({ content }) => {
       + parsedData.q3.length
       + parsedData.q4.length
 
+  // Shared grid content component
+  const renderGrid = (expanded: boolean) => (
+    <div className="grid grid-cols-2 gap-3">
+      {/* Row 1: Q1 (Do First), Q2 (Schedule) */}
+      <QuadrantCard
+        config={QUADRANT_CONFIGS.q1}
+        tasks={parsedData.q1}
+        expanded={expanded}
+      />
+      <QuadrantCard
+        config={QUADRANT_CONFIGS.q2}
+        tasks={parsedData.q2}
+        expanded={expanded}
+      />
+
+      {/* Row 2: Q3 (Delegate), Q4 (Don't Do) */}
+      <QuadrantCard
+        config={QUADRANT_CONFIGS.q3}
+        tasks={parsedData.q3}
+        expanded={expanded}
+      />
+      <QuadrantCard
+        config={QUADRANT_CONFIGS.q4}
+        tasks={parsedData.q4}
+        expanded={expanded}
+      />
+    </div>
+  )
+
   return (
-    <div className="w-full overflow-hidden rounded-xl bg-components-panel-bg-blur p-4">
-      {/* Header */}
-      <div className="mb-4 flex items-center justify-between">
-        <div>
-          <div className="system-md-semibold text-text-primary">
-            Eisenhower Matrix
+    <>
+      <div className="w-full overflow-hidden rounded-xl bg-components-panel-bg-blur p-4">
+        {/* Header */}
+        <div className="mb-4 flex items-center justify-between">
+          <div>
+            <div className="system-md-semibold text-text-primary">
+              Eisenhower Matrix
+            </div>
+            <div className="text-xs text-text-tertiary">
+              {totalTasks}
+              {' '}
+              task
+              {totalTasks !== 1 ? 's' : ''}
+              {' '}
+              prioritized
+            </div>
           </div>
-          <div className="text-xs text-text-tertiary">
-            {totalTasks}
-            {' '}
-            task
-            {totalTasks !== 1 ? 's' : ''}
-            {' '}
-            prioritized
-          </div>
-        </div>
-        {/* Legend */}
-        <div className="flex items-center gap-3 text-[11px] text-text-quaternary">
-          <span>
-            <span className="font-medium text-text-accent">I</span>
-            {' '}
-            = Importance
-          </span>
-          <span>
-            <span className="font-medium text-text-warning">U</span>
-            {' '}
-            = Urgency
-          </span>
-        </div>
-      </div>
-
-      {/* Axis Labels - Horizontal */}
-      <div className="mb-2 grid grid-cols-2 gap-3 pl-9">
-        <div className="text-center text-[11px] text-text-tertiary">
-          <span className="rounded bg-components-panel-on-panel-item-bg px-2 py-0.5">
-            Not Urgent
-          </span>
-        </div>
-        <div className="text-center text-[11px] text-text-warning">
-          <span className="rounded bg-state-warning-hover px-2 py-0.5">
-            Urgent
-          </span>
-        </div>
-      </div>
-
-      {/* Main Grid with Row Labels */}
-      <div className="flex gap-3">
-        {/* Row Labels - Vertical (rotated 90 degrees) */}
-        <div className="flex w-6 shrink-0 flex-col gap-3">
-          <div className="flex min-h-[200px] items-center justify-center">
-            <span className="-rotate-90 whitespace-nowrap rounded bg-state-accent-hover px-2 py-0.5 text-[11px] text-text-accent">
-              Important
-            </span>
-          </div>
-          <div className="flex min-h-[200px] items-center justify-center">
-            <span className="-rotate-90 whitespace-nowrap rounded bg-components-panel-on-panel-item-bg px-2 py-0.5 text-[11px] text-text-tertiary">
-              Not Important
-            </span>
+          {/* Legend + Expand Button */}
+          <div className="flex items-center gap-3">
+            <div className="flex items-center gap-3 text-[11px] text-text-quaternary">
+              <span>
+                <span className="font-medium text-blue-600">I</span>
+                {' '}
+                = Importance
+              </span>
+              <span>
+                <span className="font-medium text-orange-500">U</span>
+                {' '}
+                = Urgency
+              </span>
+            </div>
+            <ActionButton onClick={handleExpand}>
+              <RiExpandDiagonalLine className="h-4 w-4" />
+            </ActionButton>
           </div>
         </div>
 
         {/* 2x2 Grid */}
-        <div className="min-w-0 flex-1">
-          <div className="grid grid-cols-2 gap-3">
-            {/* Row 1: Important */}
-            <QuadrantCard
-              config={QUADRANT_CONFIGS.q2}
-              tasks={parsedData.q2}
-            />
-            <QuadrantCard
-              config={QUADRANT_CONFIGS.q1}
-              tasks={parsedData.q1}
-            />
+        {renderGrid(false)}
+      </div>
 
-            {/* Row 2: Not Important */}
-            <QuadrantCard
-              config={QUADRANT_CONFIGS.q4}
-              tasks={parsedData.q4}
-            />
-            <QuadrantCard
-              config={QUADRANT_CONFIGS.q3}
-              tasks={parsedData.q3}
-            />
+      {/* Fullscreen Modal */}
+      <FullScreenModal
+        open={isExpanded}
+        onClose={handleClose}
+        closable
+      >
+        <div className="flex h-full flex-col p-6">
+          {/* Modal Header */}
+          <div className="mb-6 flex items-center justify-between">
+            <div>
+              <div className="text-xl font-semibold text-text-primary">
+                Eisenhower Matrix
+              </div>
+              <div className="text-sm text-text-tertiary">
+                {totalTasks}
+                {' '}
+                task
+                {totalTasks !== 1 ? 's' : ''}
+                {' '}
+                prioritized
+              </div>
+            </div>
+            <div className="flex items-center gap-3 text-sm text-text-quaternary">
+              <span>
+                <span className="font-medium text-blue-600">I</span>
+                {' '}
+                = Importance
+              </span>
+              <span>
+                <span className="font-medium text-orange-500">U</span>
+                {' '}
+                = Urgency
+              </span>
+            </div>
+          </div>
+
+          {/* Expanded Grid */}
+          <div className="min-h-0 flex-1">
+            {renderGrid(true)}
           </div>
         </div>
-      </div>
-    </div>
+      </FullScreenModal>
+    </>
   )
 }
 
diff --git a/web/app/components/base/quadrant-matrix/quadrant-card.tsx b/web/app/components/base/quadrant-matrix/quadrant-card.tsx
index 35ca20afa8..469c4c4082 100644
--- a/web/app/components/base/quadrant-matrix/quadrant-card.tsx
+++ b/web/app/components/base/quadrant-matrix/quadrant-card.tsx
@@ -7,29 +7,42 @@ import TaskItem from './task-item'
 type QuadrantCardProps = {
   config: QuadrantConfig
   tasks: Task[]
+  expanded?: boolean
   maxDisplay?: number
 }
 
 const QuadrantCard: FC<QuadrantCardProps> = ({
   config,
   tasks,
+  expanded = false,
   maxDisplay = 3,
 }) => {
-  const { title, subtitle, bgClass, borderClass, titleClass } = config
-  const displayTasks = tasks.slice(0, maxDisplay)
-  const remainingCount = Math.max(0, tasks.length - maxDisplay)
+  const { number, title, subtitle, bgClass, borderClass, titleClass } = config
+  const displayLimit = expanded ? Infinity : maxDisplay
+  const displayTasks = tasks.slice(0, displayLimit)
+  const remainingCount = Math.max(0, tasks.length - displayLimit)
 
   return (
     <div
       className={cn(
-        'flex min-h-[200px] min-w-0 flex-col rounded-xl border p-3',
+        'flex min-w-0 flex-col rounded-xl border p-3',
         bgClass,
         borderClass,
+        expanded ? 'min-h-[280px]' : 'min-h-[200px]',
       )}
     >
-      {/* Header */}
+      {/* Header with numbered circle */}
       <div className="mb-2 shrink-0">
         <div className="flex items-center gap-2">
+          {/* Numbered circle */}
+          <span className={cn(
+            'flex h-5 w-5 items-center justify-center rounded-full border text-xs font-semibold',
+            borderClass,
+            titleClass,
+          )}
+          >
+            {number}
+          </span>
           <span className={cn('system-sm-semibold', titleClass)}>{title}</span>
           {tasks.length > 0 && (
             <span className="bg-components-badge-bg-gray rounded-full px-1.5 py-0.5 text-[10px] font-medium text-text-tertiary">
@@ -40,12 +53,20 @@ const QuadrantCard: FC<QuadrantCardProps> = ({
         <div className="text-[11px] text-text-tertiary">{subtitle}</div>
       </div>
 
-      {/* Task List - scrollable area */}
-      <div className="flex min-h-0 flex-1 flex-col gap-2 overflow-y-auto">
+      {/* Task List */}
+      <div className={cn(
+        'flex min-h-0 flex-1 flex-col gap-2',
+        expanded && 'overflow-y-auto',
+      )}
+      >
         {displayTasks.length > 0
           ? (
               displayTasks.map((task, index) => (
-                <TaskItem key={`${task.name}-${index}`} task={task} />
+                <TaskItem
+                  key={`${task.name}-${index}`}
+                  task={task}
+                  expanded={expanded}
+                />
               ))
             )
           : (
@@ -55,8 +76,8 @@ const QuadrantCard: FC<QuadrantCardProps> = ({
             )}
       </div>
 
-      {/* More indicator */}
-      {remainingCount > 0 && (
+      {/* More indicator (only in non-expanded mode) */}
+      {!expanded && remainingCount > 0 && (
         <div className="mt-2 shrink-0 text-center text-[11px] text-text-tertiary">
           +
           {remainingCount}
diff --git a/web/app/components/base/quadrant-matrix/task-item.tsx b/web/app/components/base/quadrant-matrix/task-item.tsx
index 403e1f7a97..728b692099 100644
--- a/web/app/components/base/quadrant-matrix/task-item.tsx
+++ b/web/app/components/base/quadrant-matrix/task-item.tsx
@@ -5,17 +5,24 @@ import { cn } from '@/utils/classnames'
 
 type TaskItemProps = {
   task: Task
+  expanded?: boolean
   showScores?: boolean
 }
 
-const TaskItem: FC<TaskItemProps> = ({ task, showScores = true }) => {
+const TaskItem: FC<TaskItemProps> = ({ task, expanded = false, showScores = true }) => {
   const { name, description, deadline, importance_score, urgency_score, action_advice } = task
 
   return (
     <div className="group min-w-0 rounded-lg bg-components-panel-bg p-2.5 shadow-xs transition-all hover:shadow-sm">
       {/* Header: Task Name + Scores */}
       <div className="flex items-start justify-between gap-2">
-        <div className="system-sm-medium min-w-0 flex-1 truncate text-text-primary" title={name}>
+        <div
+          className={cn(
+            'system-sm-medium min-w-0 flex-1 text-text-primary',
+            !expanded && 'truncate',
+          )}
+          title={name}
+        >
           {name}
         </div>
         {showScores && (
@@ -34,7 +41,11 @@ const TaskItem: FC<TaskItemProps> = ({ task, showScores = true }) => {
 
       {/* Description */}
       {description && (
-        <div className="mt-1 line-clamp-2 text-xs text-text-tertiary">
+        <div className={cn(
+          'mt-1 text-xs text-text-tertiary',
+          !expanded && 'line-clamp-2',
+        )}
+        >
           {description}
         </div>
       )}
@@ -42,11 +53,7 @@ const TaskItem: FC<TaskItemProps> = ({ task, showScores = true }) => {
       {/* Deadline Badge */}
       {deadline && (
         <div className="mt-1.5">
-          <span className={cn(
-            'inline-flex items-center rounded px-1.5 py-0.5 text-[10px]',
-            'bg-components-badge-bg-gray text-text-tertiary',
-          )}
-          >
+          <span className="bg-components-badge-bg-gray inline-flex items-center rounded px-1.5 py-0.5 text-[10px] text-text-tertiary">
             {deadline}
           </span>
         </div>
@@ -54,8 +61,14 @@ const TaskItem: FC<TaskItemProps> = ({ task, showScores = true }) => {
 
       {/* Action Advice */}
       {action_advice && (
-        <div className="mt-2 overflow-hidden border-t border-divider-subtle pt-2">
-          <p className="line-clamp-2 text-xs italic text-text-quaternary" title={action_advice}>
+        <div className="mt-2 border-t border-divider-subtle pt-2">
+          <p
+            className={cn(
+              'text-xs italic text-text-quaternary',
+              !expanded && 'line-clamp-2',
+            )}
+            title={!expanded ? action_advice : undefined}
+          >
             {action_advice}
           </p>
         </div>
diff --git a/web/app/components/base/quadrant-matrix/types.ts b/web/app/components/base/quadrant-matrix/types.ts
index 044161aed1..b86e686cf4 100644
--- a/web/app/components/base/quadrant-matrix/types.ts
+++ b/web/app/components/base/quadrant-matrix/types.ts
@@ -15,11 +15,12 @@ export type QuadrantData = {
   q1: Task[] // Urgent & Important - Do First
   q2: Task[] // Not Urgent & Important - Schedule
   q3: Task[] // Urgent & Not Important - Delegate
-  q4: Task[] // Not Urgent & Not Important - Eliminate
+  q4: Task[] // Not Urgent & Not Important - Don't Do
 }
 
 export type QuadrantConfig = {
   key: 'q1' | 'q2' | 'q3' | 'q4'
+  number: number
   title: string
   subtitle: string
   bgClass: string
@@ -27,9 +28,13 @@ export type QuadrantConfig = {
   titleClass: string
 }
 
+// Layout based on Eisenhower Matrix:
+// Q1 (Do First) - top-left, Q2 (Schedule) - top-right
+// Q3 (Delegate) - bottom-left, Q4 (Don't Do) - bottom-right
 export const QUADRANT_CONFIGS: Record<string, QuadrantConfig> = {
   q1: {
     key: 'q1',
+    number: 1,
     title: 'Do First',
     subtitle: 'Urgent & Important',
     bgClass: 'bg-state-destructive-hover',
@@ -38,6 +43,7 @@ export const QUADRANT_CONFIGS: Record<string, QuadrantConfig> = {
   },
   q2: {
     key: 'q2',
+    number: 2,
     title: 'Schedule',
     subtitle: 'Important & Not Urgent',
     bgClass: 'bg-state-accent-hover',
@@ -46,6 +52,7 @@ export const QUADRANT_CONFIGS: Record<string, QuadrantConfig> = {
   },
   q3: {
     key: 'q3',
+    number: 3,
     title: 'Delegate',
     subtitle: 'Urgent & Not Important',
     bgClass: 'bg-state-warning-hover',
@@ -54,7 +61,8 @@ export const QUADRANT_CONFIGS: Record<string, QuadrantConfig> = {
   },
   q4: {
     key: 'q4',
-    title: 'Eliminate',
+    number: 4,
+    title: 'Don\'t Do',
     subtitle: 'Not Urgent & Not Important',
     bgClass: 'bg-components-panel-on-panel-item-bg',
     borderClass: 'border-divider-regular',