At present it's not possible to zoom out further than 10% in the layout view in the Construct2 Editor. This makes it incredibly difficult to design large levels as I need to constantly scroll around the screen when placing and sizing tiled backgrounds over large areas and it's impossible to "eyeball" the whole layout.
Having searched through the forums I'm surprised to see this has not been raised in the past. I assume this is because most Construct users are making mobile games with small layouts.
I have large layouts (100k by 200k) made up mostly of tiled backgrounds (a GTA-lite PC game which runs well). At a resolution of 1920x1080 on my monitor I'm restricted to roughly a 14k by 10k view of layout editor at 10% zoom which is nowhere near enough.
Appreciate if Ashley would consider extending the zoom out to 1% - hopefully it's a very minor piece of work that can be addressed in a near future Construct2 build.