TMF didn’t bother, so I took a few minutes (OK - probably a couple hours) to figure it out and write it up. Here is how to add your old favorite boards to what this platform calls the “Sidebar”.
It’s also important to note that if you are a member of a premium service and therefore have access to the premium boards, those are a separate set of boards. So you’ll need to do this once for the free boards and again for the premium boards.
–Peter
PS - Not to defend TMF in any way, but apparently these categories and tags are actually new to the platform they have chosen and is still in beta testing. So we’re all a bunch of beta testers here. Personally, I would have put the transition on hold for a bit just to have a thoroughly implemented version of this feature, and then done the migration using it. But TMF chose to push forward and give us a half-assed transition instead of taking the time to do it right. They deserve all of the pushback they’re getting from their users.