Open each, scroll to the very bottom (and try pulling past it). Note which ones let you scroll past the green END box into blank space.
1. Current studio — Short page (like login) 1. Current studio — Long page (like credits) 2. Fixed to screen — Short page (like login) 2. Fixed to screen — Long page (like credits) 3. Natural height — Short page (like login) 3. Natural height — Long page (like credits)