Do you happen to know what the GMS 1.4 equivalent for Camera would be?
Viewing post in [Q} GMS - How do we make a 64x64 screen?
Unfortunately I don't. I jumped onto Gamemaker in GMS2 so I'm not familiar with the 1.4 build.
I know the camera works by 'viewing' a set area. The viewport itself in GMS2 is the window you actually see. So perhaps there's a way to program in a view of a set area and get that sent to the viewport? Sorry I can't be more help.