The following sidebar tabs give examples of grouped lists created by nesting.
Types Tab
For the Types tab, the outer list filter as shown below selects each discrete value found in the type field. The inner list filter selects all the (non-system) tiddlers with that type.
Recent Tab
The list in the Recent tab is generated using the timeline macro. Here, the outer list filter selects each discrete day found in the modified field, while the inner list filter selects all the tiddlers dated the same day in the modified field.