XYplorer Beta Club

I would like the new Rapid Access folder to stay visible while in Mini-Tree mode.

It doesn't? The Mini Tree does not forget.

Without mini-table enabled, the Rapid Access folder is visible. With mini-tree enabled, the Rapid Access folder disappears.

Well, you need to access it once in Mini Tree to be added.

Yep. Just paste Rapid Access into the address bar and press ENTER.

And you could also reach it via the first dropdown in the breadcrumb bar. (Not in your screenshot though because your current path is so long that it shows the overflow icon instead, and much too small by the way, a little I'm going to fix now.)