Hi marcingolf,
We understand you're having issues with features or options in a 3rd party application. We're happy to offer some guidance.
If something in an application is not working properly, you'll want to try the basic steps of checking for app updates, and uninstalling/reinstalling the application: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open
If something in the app is still not working, you'd want to contact the developer of that app to let them know of the current issue it has.
How to contact an app developer
Hope this helps. Cheers!