How do I confine player movement area at layout's end?

I'm trying to make a platform game where there is a boss at the end of the layout. To allow the player to focus on the boss, I wish for the layout to have 0% x 0% parallax when it reaches that area. Do I have to create a new layout for this to happen or is there a way to keep it in the same layout? Any comments or help is deeply appreciated. Thanks!

I'm guessing you have the scroll to behaviour on the avatar or on an object tied to the player's position?

If so, the simplest way would be to disable the scroll-to behaviour on the avatar/camera once the avatar passes into the boss area.

Another way, if you're using a camera object, would be to disassociate the camera from the player on reaching the boss area and move it the centre of the area.