How to hide Cyan Line at bottom of screen

Using bazzite-asus-nvidia:40, on the bottom of the screen is a 1px tall cyan/azure line that will cause burn-in on my screen.

This isn't "System Settings/Mouse & Touchpad/Screen Edges". Changing every setting (Themes/Schemes/Style/Decorations) in "System Settings/Color & Themes" did not effect this line.

This may be related to the Taskbar's edge of screen detection, but I can't find any Taskbar setting to disable it either.
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