Is it okay to ask plumber to revise toilet pipe placement?

Hello, Im looking for advice about my toilet that’s going to be installed. I’m having an extension and the toilet cistern pipe has been placed at the left hand side of the waste. The toilet I’m going to have plumbed in has a right side inlet. The pipe work is in its early stage but a sheet of floor has been laid next to it already. I understand that a flexible connection can be used but with a brand new bathroom, I’d ideally like to not see additional pipes. I’m nervous to ask the plumber to amend before the job proceeds more. I’d ideally to get it right in the at this early build stage. Is it acceptable to ask the plumber to revise or will they be upset and say to just use a flexi pipe? Help from a widowed renovator!