@AngryGenXLady @LuigiEsq @BernieOrVest It's a preference for the posting screen. It doesn't change anything that's already been posted. Because Mastodon allows you to choose privacy level for each new post, there's no switch to toggle all of them at once.

If you care about those posts being public, you can use the "Delete & redraft" option on them to re-post them while selecting a different privacy level