You can adjust its size as the edge of the windows.
- Click the right mouse button on a blank area of the office and ask Customize.
- Click Color and appearance of windows.
- Click Open classic appearance properties ...
- Click the Advanced button.
- Select Border active window.
- Change the size (default value is "1", try "10" for fun!).
- Confirm your settings via the OK button.
Enjoy this cool trick.
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