Hi! Mine's A30s and the in game screen recorder button is still there after updating it to Android 10. The game icon, where you can find the record button, is placed below the 3 lines button. It is no longer on the top where it is used to be. You might want to double check if your's running the latest software. Hope this helps.
Depending on the unit. For A50 updated with Android 10, the screen recording feature for Game Launcher has been removed to give way the screen recording feature for all apps, not just restricted only for the game.