Is it possible to position the canvases in the main workspace? For example, I'd like my Canvas1 to be above Canvas 2. By default it puts Canvas 2 to the right.
Sorry it's not possible.
But we're thinking about implementing such a feature. You can also vote for this idea.
thanks. Is it at least possible to change the order?
Yes, you can just change the order in the list on setup output page (grad and drop).
Good Luck !