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Appearance & Customization

X21 provides several customization options to tailor the interface to your workflow.

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Resizable Input Area

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Adjusting Input Height

The input textarea can be resized:
  1. Hover over the top edge of the input area
  2. Resize handle (dots) appears
  3. Click and drag up/down
  4. Release to set height
Benefits:
  • More space for long prompts
  • Better view of multi-line requests
  • Comfortable typing area

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Auto-Scroll

The input area automatically scrolls as you type multi-line prompts. All UI components (buttons, panels, text) adapt to the selected theme.

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Panel Layout

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Collapsible Sections

Collapse sections to focus:
  • Thinking blocks: Click to expand/collapse
  • Tool details: Click to show/hide parameters
  • History panel: Toggle with Ctrl+H
  • Tools panel: Toggle with Ctrl+Shift+T

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Conversation View

Messages display with:
  • Clear sender labels (You / Assistant)
  • Timestamp for each message
  • Expandable content blocks
  • Syntax-highlighted code

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Accessibility Features

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Keyboard Navigation

Full keyboard support:
  • Tab: Move between interactive elements
  • Arrow keys: Navigate lists
  • Enter: Activate buttons
  • Escape: Close overlays

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Tooltips

Hover over buttons and icons for descriptions.

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Focus Management

  • Input auto-focuses on startup
  • Focus returns to input after actions
  • Clear visual focus indicators

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Workspace Organization