Make the Draw function easier to edit after you have drawn a line, text, etc and need to come back to it.
I had trouble editing text, arrows, and colors of the lines. A button that you can get to a mouse arrow that can select objects you have drawn, and also can double click to edit them would help.
Der Meister commented
Need a way to undo any drawn line. Not all of them or the last one and work back. Cursor on line and eliminate that line with a click