Why ?
Stop Move:
When I moving: What is this?
Hey there, is that just an image in a UMG widget? Try setting the scope texture to No Mipmaps and on the compression settings set it to UserInterface to see if it helps.
Not use UMG widget, but I still try setting texture NoMipmap and compress mode, no effect.
I only put a plane with below material at camera forward.
I would probably do it with UMG, you shouldn’t have those problems.