file
- New
- Open
- Save as
  - jpg
  - png
  - web
    - gif
    - webp
edit
- Undo
- Redo
- Cut
- Copy
- Paste
view
- Zoom
- Night
- Default
Tool
- Analyze
- Add Space
- Settings
  - General
  - Performance
  - Style
help
- help
- about

This is a window

demo1
demo2
demo3

demo1

this is a tab demo.

AAAAAAAAAAAAAAA

AAAAAAAAAAAAAAA

AAAAAAAAAAAAAAA

AAAAAAAAAAAAAAA

AAAAAAAAAAAAAAA

demo2

this is a tab demo.

BBBBBBBBBBBBBBBBBB

demo3

this is a tab demo.

CCCCCCCCCCCCCCCCCCC

CCCCCCCCCCCCCCCCCCC

CCCCCCCCCCCCCCCCCCC

This is a demo.