Hello, my name is***** to Justanswer! Give me just a few minutes to look up some specifics, I'm working on this now.
Hi, my name is Rusty. Sorry to hear you're having problems, this isn't a setting. Facebook basically hijacks your phone with the messenger app, and leaves you vulnerable to identity theft. It's designed to learn more about you to sell to big corporations, so it always defaults. It's not a setting on your phone, it's the app itself. I would recommend removing it from your phone immediately.
Hi there and welcome
this can be caused d by an app you have downloaded, for example, alarm tone has a habit of causing this.
Uninstall any apps you installed around the time this issue occurred and let me know if this stops it please.