I pressed "Migrate old configuration to new format" and now I have no menubar or status icons

I wasn't sure what this did but I pressed it anyway and now all that's showing are my buttons.

Any idea what it did or if I can roll it back?

that might have auto enabled the notch bar feature. Right click the menubar and choose "Hide Bar". Afterwards disable the Notch Bar feature in the BTT settings

Hmmm.
It's weird. I want the notch bar but I can't get it back.
Any idea what's happening.
Traditionally, this has always been my mistake so apologies in advance.

Ignore this. I just didn't understand the new way of doing things.

Worked it out now.