Hi guys -
Believe it or not you can use the edges to move the map and corners to re-size the map. Your cursor has to be within the dark grey border area. Unfortunately the cursor icon doesn't change to let you know you're in the right spot, so for now you just have to use trial and error to find the right spot. We recognize this lack of visual feedback combined with very small "grabbing" area is frustrating and we are already working on fixing this issue for the next release.
Thanks for your feedback, I hope this helps!
Scott