Yes, please move this to the Fusion 360 forum.
There are actually TWO issues.
One is the Fusion Electronics specific popups that come when you right click on a component in a schematic (actually, a THIRD issue that this popup only come randomly, I sometimes have to right click several times to make it pop up).
That popup will normally fade with times. But I've had situations where it doesn't. Like I mentioned in my original post. It was stuck. I have to go back to Fusion to make it go away.

Shown right here on top of this post I'm writing right now!
Another thing is the Fusion Browser list, and in Electronics, the Inspector, Design Manager and Selection filter "tabs". They also sometimes end up on top of another window.
That is a little harder to recreate.
But I can make them go bonkers in another way, simply by moving the Fusion window to the edge of my screen. I have dual monitors, but I think it would be the same issue on a single monitor.

This is how it looks when the Fusion window is at the border between two monitors.


Here, the Fusion window is at the right side of the screen.
An even worse situation is if I put the Fusion window at the LEFT side of my LEFT monitor.
If it's dragged out so the browser list goes over the edge, the whole browser list will end up on my RIGHT monitor!
I didn't include a screenshot as it would be very big.