Needs a little more. Read ETA for solution
ETA: I have added another star because I figured out a work around. It would be great if this could be mentioned somewhere to save time and frustration!
To keep your map and virtual walls, instead of telling the robot to just clean the whole area, use the “area clean” box on the screen of your last map. You can drag the corners of the box to cover your entire map and it will observe your virtual walls. I hope this can save someone some time!