Quick Access window jumps all over the place

Thanks for this, sullimander!

I have seen it change positions when I switch from using an external monitor to my laptop display.

That's the most consistent kind of trigger we've seen for this on our end too (although we're still working on the specifics and want to make sure we have as comprehensive an understanding of the issue as we can).

Ideally, it would always be centered on the primary display (or the display with the mouse focus).

I agree! Thanks for letting us know what you've seen with your setup. We'll get to work!