On the MacBook Pro 14" when connecting to RDP the desktop displayed cuts off about 20-30 pixels at top and bottom. The MacBook display is set to "Default for this Screen" btw This is a great app...
Actually with some searching I found the fix! Open the Get Info box for the app and check the “scale to fit below the camera” option (about ½ way down) Dismiss the Info box and it works fine after that