This started out as a question for the forum, but I solved it while preparing the question. It seems like other people have had this problem so I’ll post what happens and how to solve. I added breakpoints xlarge and xxlarge. But even when I used xlarge and xxlarge, it wouldn’t go any wider than 1200px. So, I assumed SASS wasn’t working properly, but… I did not also adjust the $global-width. See below. Hope this helps someone.