The Toolbar/Sidebar Interface Issue - User Feedback - Blender Developer Talk
How can I close windows in Blender? Sometimes I can close a window easily but when I do the same exact thing for another window... voila! I got a new window. I
3d view - How do you change camera safe area transparency? - Blender Stack Exchange
Measure — Blender Manual
Blender Viewer Windows - How to Collapse, Join, Close Tabs in Blender - YouTube