Help - can't find my other Calibre libraries!

I have three Calibre libraries but I mainly use only one of them on a day-to-day basis. I only just noticed I can't find the other two libraries. The folders are in the same location they've always been.

I'm sure it's something totally simple I'm overlooking but I would appreciate some help figuring out what that is :blink: (I'm updated to 0.8.55)

Thanks!