Sleep on it would be my advice then revisit it tomorrow and decide if you can live with it or not.
If not, you need to discuss it with him and how he can rectify it to your satisfaction.
Would it be possible for him to remove the glass panel, after marking where it sits, then cutting the wall tiles on the wall with some sort of angle grinder? I don't know if that can be done as I'm not a tiler.
The glass panel could then be put back and possibly some sort of quadrant beading on the outside to cover the raw edge.
Either that, or take the tiles off and redo that section trimming the tiles to fit properly.
My plumber happily "trimmed to size", my carefully measured, expensive stainless steel shower curtain rail thereby rendering the shower space in the wet room approximately half the size I actually wanted.
He'd fitted it, drilled holes in the new tiles etc but I told him I wasn't happy but would sleep on it and let him know what I wanted the following day.
I decided I couldn't live with it and I sent for another rail and he replaced the drilled into tile and refitted the rail.
His attitude was, I was the customer and he wanted me to be happy with his work when he'd finished the job.
I hope your plumber is as obliging OP.
Good luck.