Business Variable: Tree Layout

I’m using Grafana Business Variable.

I’ve managed to implement a tree layout related to Geographical Data.
Something like:

Regione → Provincia → Comune.

Once selected one element all the other disappear.
The problem is that I’m not able to get back to the complete list.


Above is an example where I’ve selected Basilicata (one of Italy’s 20 regions), but I’m not able to get back to the full list of 20 regions.

Any help would be appreciated.

Thanks