What is this (Flying Camera/ Shift+F)

Hey there,

Man… I’m at a loss on how to fix this. It’s probably super easy. When I go to camera view “0”, and then hit Shift+F to float. Once in a while, I get this center point off in the corner or upper part. See attached. How do I center it? My mouse always centers on that target box thing and I can’t center it again?