I've dropped back into Portal 2 as the Map Creator DLC has recently been released. This allows you to create maps (from basic through to advanced) with a number of limitations. However, I cannot, for the life of me, work out how to rotate things.
I have this ramp:
How can I get it to face the exit, rather than looking at the wall? I've tried all manner of keyboard keys and shift-click, ctrl-click.