Scratching my head here. I was excited about trying the new "Exclude files from pull requests" feature, and to do so, I had to enable the "New pull request experience". I have done so, but it appears to have no effect on our PR's. No matter what I try, I get the old experience.

I've tried logging out and back in, creating new PR's after enabling "New pull request experience", and no matter what, I'm getting the old experience:

Please advise? I'd really like to try out "Exclude files".