Keep folders on top (in content listing) - MacOS
This is the default behavior on Windows, but on Mac, it's not. However, in Finder preferences, there's the option where you can choose to keep folders on top, but it doesn't affect the sorting in Bridge. Bridge should adjust the sorting according to the Finder's behavior or there should be a way to set this manually. It's doesn't make much sense to have one sorting style in Finder and a different one in Bridge.
Maybe lifelong Mac users don't see the point, but I switched from PC some time ago, and I find sorting with keeping folders on top much more useful (especially in Bridge).