A bit of a niché, totally non-urgent one but I'm seeing slightly odd behaviour with the App's UI. If the UI is resized by dragging the right edge to the left until it meets the left studio (when there are panels in the left studio) and then returned back to full-screen width the double-headed arrow for changing the right studio panel widths is no longer available on mouse hover, though it is available with a very precise mouse click. This doesn't seem to affect the left studio when doing the same in reverse...
A Reset studio makes no difference but closing and opening a new document seems to reset everything so it then works as expected.
Note: This affects all V1.X and V2.X versions on macOS.
UI Width.mp4