How do I zoom in differently for each level?

Going from level to level I will have large and small puzzles. For each level, how do I zoom in on different sized puzzles so they will fill most of the screen? Each level will have a static zoom.

https://www.dropbox.com/s/abjillm9tmfe1 ... .capx?dl=0

You can use 'System>Set layout scale' for this. Something like this should give you a roughly appropriate scale

min( WindowWidth \ Puzzle.Width , WindowHeight \ Puzzle.Height )

Thanks. Actually "layer scale" was what I needed instead of "layout scale".

After practicing, I was expecting scrolling to change the zoom focal point, but it doesn't. How do I change the focal point for a zoomed layer?