It would be nice to have the collapse button on top of the bottom panel and on left of the right panel when they are expanded. Such location is more ergonomic because it will be in the same direction as returning to the main frame. Example for the bottom panel:
- Move up to close the panel
- Continue moving up to return to the main frame
With the current location I need to change the mouse movement direction. For example for the bottom panel:
- move down to close the panel
- move up to return to the central frame