Would work a lot better if canvas had a 'draw layer into me' action but meh....
Basically I saw a trailer of Lego Indian Jones 2, and it had this awesome feature where when two players were close to each other it used one screen, but when they were appart the screen 'ripped'. But it was so...elegant...such a lovely solution to the whole 'make other play catchup' problem or the 'not enough screen space' problem.
So I had a go at doing something similar in Construct
helpful tip for people making canvas split screen, put all the objects in a family and paste the family, it save the trouble of making multiple actions, and to my surprise it places them in the proper order .