You can't leave a group text on your Android phone, but you can still mute or delete the thread in your Messages app.
Recovering deleted text messages on Android is difficult, and the best strategy is to have Google Drive back up your phone.
When I made the switch from my iPhone 15 Pro Max to a Galaxy S25 Ultra earlier this year, one of the first things I missed was the ability to delete text messages that I'd sent. The ability to unsend ...
The latter is the existing behavior, while the first one will let you truly remove something that was sent to another contact/everyone. That said, Google does note how “Messages may still be seen by ...