How to remove this kind of shower mixer?

[Thomas590123]

Hi all, I'm trying to remove this shower mixer however, I cannot see any bolts like all the other ones I see online.

Please can someone advise. I've taken a picture of it: Screenshot - https://prnt.sc/YS6WnqriFxHP

 

[fowlerboi]

I would expect those bits highlighted to be nuts. Should be able to get a spanner on them and turn anti clockwise. If its completely round you may need a pair of grips, but double check they are nuts first

At least thats how most bar showers are designed