Not sure if this has been suggested before or not. I couldn’t find mention of it.
I would find it very helpful if the Advanced Flow editor had the ability to draw straight lines, and simple shapes (rectangles, ovals, cloud) that you could resize and change colour of. That would sit on-top of the grid, but behind your Flow. This would be helpful with creating more complex Flows, as you could organise them, or visually separate different parts of your Advanced Flow.
Or is this me just being too logical/OCD?
