When you don't like what the app has come up with in terms of charging stops, you can swap a charger for an alternative, but only within an quite small radius. Please let me select other options further afield! At the moment I'm having to select one in the direction I want, and then swap again, until I'm close enough to the charger I want. Painful!!
In this situation you've already accepted the initial plan and we will not presume you'd want a much different route when asking for other charging options.
If you'd want a very different plan I would recommend looking over your settings.
Do you have an example plan? If you please share the link with us so that we can have a look.