Help! does anyone know how to port third person over to side scroller without any gameplay issues?

I’m making a Platformer with Act 1, Act 2 and Act 3 for every level.
Act 1 is a basic Side Scroller
Act 2 is a Third Person based version of Act 1
Act 3 is a First Person based level where you shoot down walls to continue the level.

i made a Third Person and First Person project where i imported the levels from, but when i load them in my project, SonicUE, they play like the Side Scroller, even though there code is still there, like it should be, so i don’t understand what i need to do to fix this? any help guys?