Widget 2.0 has a new grouping mode: Drilldowns.
You can switch to Drilldowns by using a “Common group - Drilldown” switch in the widget settings:

‍

There are four options available in this mode:

Group By - a drop down where you can select variable for top-level grouping

Group name (custom name for your group)

Filter (same filter option as in widget 1.0)

Drills (here you can add, configure or remove additional levels of grouping):

- To add one - click blue “Add drill” button

- To rename/select/delete drills - click “Config” and use the corresponding controls in the pop-up menu.

‍