How can I influence the length or duration and direction of a round tour during planning?

For the Android version:

To adjust the length or duration of a round trip during planning, you must enlarge or reduce the circle accordingly. To change the direction in which your circular tour should run, simply turn the circle. You will find all the necessary steps and information in the planning view of a circular tour at the top of the app screen.

For the iOS version:

You can change the direction and length of the circular tour using the settings at the top of the smartphone display.