diff --git a/web/app/components/base/prompt-editor/plugins/hitl-input-block/__tests__/input-field.spec.tsx b/web/app/components/base/prompt-editor/plugins/hitl-input-block/__tests__/input-field.spec.tsx
index c6905da9f7b..62ac5e5181a 100644
--- a/web/app/components/base/prompt-editor/plugins/hitl-input-block/__tests__/input-field.spec.tsx
+++ b/web/app/components/base/prompt-editor/plugins/hitl-input-block/__tests__/input-field.spec.tsx
@@ -109,7 +109,11 @@ describe('InputField', () => {
     const scrollBody = panel?.children[1]
     const footer = panel?.lastElementChild
 
-    expect(panel).toHaveClass('max-h-(--shortcut-popup-max-height)', 'overflow-hidden')
+    // The max-height falls back to a viewport unit so the panel stays bounded
+    // (and the footer/actions reachable via the internal scroll) even when it is
+    // rendered outside the shortcuts popup that defines --shortcut-popup-max-height,
+    // e.g. inside the edit dialog. See issue #37979.
+    expect(panel).toHaveClass('max-h-[var(--shortcut-popup-max-height,80dvh)]', 'overflow-hidden')
     expect(header).toHaveClass('shrink-0', 'pb-2')
     expect(scrollBody).toHaveClass('min-h-0', 'flex-1', 'overflow-y-auto')
     expect(footer).toHaveClass('shrink-0', 'bg-components-panel-bg')
diff --git a/web/app/components/base/prompt-editor/plugins/hitl-input-block/input-field.tsx b/web/app/components/base/prompt-editor/plugins/hitl-input-block/input-field.tsx
index 6d7ad432db4..a18b336d91b 100644
--- a/web/app/components/base/prompt-editor/plugins/hitl-input-block/input-field.tsx
+++ b/web/app/components/base/prompt-editor/plugins/hitl-input-block/input-field.tsx
@@ -216,7 +216,7 @@ const InputField: React.FC<InputFieldProps> = ({
   }, [handleSave])
 
   return (
-    <div className="flex max-h-(--shortcut-popup-max-height) w-[372px] flex-col overflow-hidden rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur shadow-lg backdrop-blur-[5px]">
+    <div className="flex max-h-[var(--shortcut-popup-max-height,80dvh)] w-[372px] flex-col overflow-hidden rounded-xl border-[0.5px] border-components-panel-border bg-components-panel-bg-blur shadow-lg backdrop-blur-[5px]">
       <div className="shrink-0 p-3 pb-2">
         <div className="system-md-semibold text-text-primary">{t(`${i18nPrefix}.title`, { ns: 'workflow' })}</div>
       </div>