The magnifier is actually very useful to ensure you've accurately focussed on the ground glass screen. As CT says it just clicks out of the way if you push it down & there's a little slider on top of the finder to swing it back up again.
Oh, and watch out - the magnifier lens has a tendency to unscrew itself as you carry the Bronny about. I've had it fall out of the finder more than once & had to scrabble around on the deck looking for it.
You'll enjoy the camera, no doubt about that.
S