Which Android app today can i set up to always show at the start ONLY the local feed from the instance and not anything elsewhere?

As the title says, i want to be able to set it up so that when i open the app i ONLY see the stuff from the instance at the start and not from any federated one until i tab away or something, to use with a tiny private instance. Does this exist?

Bonus points if it's a FOSS one on FDroid.