Thanks for the info and sorry for my question. With a little thought I should have come up with the solution myself.
I originally meant adding a new route point outside of the route lane.
But the solution is basically the same, you can drag the route lane to the desired point and the route point will then be set correctly.
Since i switched from Tyre to MRA, i have not worked with drawing the route lane because MRA (unlike Tyre) does not show a live preview of the new route. A long time ago, however, I opened my own topic for this. I really miss this feature.