Develop App without icon in top bar

I’m new in app developing for nextcloud and so I have followed the tutorial app. (GitHub - nextcloud/app-tutorial: Tutorial app which is built in the tutorial)
Now I’m trying to create a new register app that shouldn’t be visible in the top bar.
How is it possible to hide this icon but allow the app to be opened?

I know the extention AppOrder but there all users could enable the app again to be shown.
Is there a configuration that is used?

Register the routes but don’t register a navigation entry. Then the app can be accessed via URL but doesn’t show in the top bar.

app-tutorial/info.xml at master · nextcloud/app-tutorial · GitHub is the part to omit.