. Resize sketched line

This is a very simple question. I am trying to change the length of a line I drew as a sketch. I would have assumed to be able to do that by dragging with the pen. But all I am able to find is resizing by setting a new numeric length. Am I missing something?
L x

You can move the end points of the line as well.

Yes, you can move the endpoints but make sure to stay on the purple line or your angle will change. This is where an “extend” command would be very helpful.