If your cleaner does not seem to change modes or power after making a selection from within the app then the cleaner may be stuck on its last cleaning mode selected.
This can be solved by a simple power reset:
Turn off the robot using the red switch on the side:
Then remove the cleaner from its charger base:
Then repeat the process by turning on the cleaner, and return it back to the charger base, you will then have full functionality back from within the app.