I know a lot of people like this feature, which i can understand, but i think it is annoying as hell to have yet another thing popping up in my screen i didn’t ask for…
Edit: turning off animations in developer settings also turns off the animation of the pop-up. Still not ideal, but might be a little more ‘bearable’ for some…
That’s your rotate screen, you can probably turn it off in the swipe down toggles, but if you reactivate it, it will show up again. If your phone doesn’t support that natively, you could try custom ROMs or mods, maybe even just switching launchers.