When I dragged the layer box (scrolled with click drag?) this layer entry got stuck being rendered over everything somehow:

https://i.imgur.com/eZv50dx.png

It is being drawn over everything. It's not confined to within this image window. If I pop FGU into windowed mode so it's outside of the frame and then return it to fullscreen it's still there. I

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Additionally, though I'm not sure how this happened, a tooltip box appears above the cursor that reads "Set Visibility" even if the cursor is just hovering over for example the FG desktop and follows the cursor until I click.

Restarting removed both of these issues, but I thought you might want to know these can get stuck.