Same problem. Large pop up in corner of the screen. Click cancel and it just reappears seconds later. It's my neighbors device I can tell from the name. Totally ruining my viewing experience. I see no options to disable this.
My Samsung smart TV has been a disapointment.
Go through the menu and turn off the bluetooth.
This does work need this remote https://www.amazon.com/gp/aw/d/B08C2X9JYZ?psc=1&ref=ppx_pop_mob_b_asin_title