Posting a photo here in the comments would help us help you.

Sorry, the photos didn't post.

Thank you. We can't do the quartz because the sink is too far back so there would be no room for the faucet. I am not happy with this, but have learned to adapt.

I am still having a hard time picturing how this will look, but hopefully the contractor knows what they're doing.

So remove the window trim and tile the whole wall, trimming the window entirely with schluter. Someone didn’t communicate to the quartz installer that there would be a stone backsplash.

Leave the trim, except cut of the bottom couple of inches all the way across and replace with a window stool. Then tile under that.

Get a faucet that can be rotated and have the handle mounted on the front instead of the side. Bonus: you get less drips on the counter with the handle in this position. I did this in my previous kitchen and it worked well.

I wish we could do a window stool, but the window is flush with the drywall so there is nothing to attach the window stool to? The window is not inset at all. I guess I could ask the contractor, since I think that would look better than their plan.