Editing/undo part of route in MyDrive routeplanner

When I accidentally make an error (i.e. accidentally clicking or dragging with the mouse) when creating a route in MyDrive routeplanner I strongly miss an "undo" possibility instead of trying to hit a small white dot and drag the route back to where it came from which is almost impossible.
This is the right one:
And this is the error to be "undone":
Is there a way to correct such thing without starting all over again?
Thanks in advance.

Mac