16 Aug 2023, 21:26

To expand on Nick's comment:
Via the app:

  • Route lab
  • pick a route to edit
  • Show route details (down the bottom)
  • Waypoints
  • hold & drag the waypoint you want to move
  • Hide route details (now at the top!)

Done!

Quite a few steps to write, but less than 30s to do.

[EDIT: if you want to add points partway round a route, you can tap/hold on the route line and add a new waypoint that will drop between the existing ones. If your new point is off the route, then add one on the route but nearby, and then drag it to the correct place.]