Restricting Object Movement To Certain Planes

Yes there actually is. It’s under the physics tab. Expand the menu and scroll down. You need to do this for all relevant objects though.

I’m trying to make a sidescroller for a project, and noticed that my character’s interactions with physics actors allows them to leave the play area and go into the background/foreground. Is there a way to restrict their movement to the movement planes my character is on?