I use ElvUI, and have for years, but this has never been a problem.
That’s the top left corner of my screen, and where my damage meter usually sits, but lately that half of a yellow tip box thing has been popping up and I cannot close it or move it, and I’m wondering if I can somehow fix it so I can put my damage meters back =(
By default it’s pointing to a GameMenu button you’re supposed to click to update with something that’s changed eg. you’ve just leveled and a new talent point is available
If you place your mouse just below the arrow, does ElvUI display the game menu (and the button you’re supposed to click)?
I can’t click anything near or on it =(
type /fstack and hover your mouse over the frame and see if it has a name.
If so, you should be able to
/run nameoftheframe:Hide()
But maybe asking in the ElvUI forums might get you better information.