From what I've read this is existing functionality that is currently broken within the modern list experience. I would like to see it fixed so that I can set a default view for the root library folder and then have a different default view when navigating the sub-folders. In my case, the root would contain a folder or each customer, and then within each folder I'd like the view to group by Location and Project number. Then within each document set filter by document type.

The settings seem to be available, but are just not functioning properly.