Favorite tree button.

In TestOps there is an option to create different kinds of Test cases views in different hierarchical types by using trees.

You can read more about how to create trees in this documentations:
Trees in TestOps
How TestOps uses custom fields

With the "Favorite tree" button you can add the selected mapping to the Favorite and have quick access to it.

Here is simple video for you to show how you can use Trees and the Favorite tree button.