Intelligently hide panel very sensitive with 2x window scaling
Debian Testing/Bullseye 64-bit Xfce version 4.16:
On a display with a resolution of 3840x2160, where Window Scaling is set to 2x under Settings<Appearance<Window Scaling, the automatic hiding of the lower panel (Panel 2) hides on any window that is past the horizontal middle of the screen, whereas on a display with a given resolution of 2560x1440 (or any 16:9 resolution for that matter) with 1x Window Scaling, the panel hides only when a window overlaps with it, which to me is the expected/intended behavior.
N.B.: Please don't confuse the Window Scaling being set to 2x as the same as the Scale option under Settings<Display being set to 2x.