Using /fstack, I get:

Frame Stack (125.54, 723.69)
DIALOG
<2> CompactRaidFrameManagerContainerResizeFrame
MEDIUM
<0> UIParent
WORLD
<0> WorldFrame

The /Hide command in Move Anything, does not accept the Enter key when I enter /Hide WorldFrame or /Hide CompactRaidFrameManagerContainerResizeFrame.
Nor does a keybind set for hiding the current frame.

The frame only appears sometimes in battlegrounds, but it covers up many of my unit frames along the side of the screen, and part of my chat box.
Once it appears, it doesn't disappear for that battleground.
Kind of annoying, and wouldn't mind having it go away for good.