I am not sure how to switch back to aerial view in the FPS mode. When I press top, it takes me to the flat checkerboard pattern, but I still can’t see or have to look around objects to see if I’ve placed it correctly. Help please?
Do you want to be in the perspective view or in the orthographic one? 
perspective, I think I figured it out, but go ahead and let me know how just in case I got lucky. =)
Here you can change it:
