The View Filter allows users to quickly and efficiently access filters that have been saved within the Advanced Filter, and/or Views that have been saved in the Views tool inside the Data Table, that may or may not contain a filter.
Once any View Filters have been saved, they will appear in the View Filter dropdown in the Interactive Legend.

To create and save a View Filter from within the Advanced Filter, select the Save View Filter after applying the filter.

You will then have the option to either create a new view, or overwrite an existing one. These saved View Filters will then be available for quick and easy access in the View Filter dropdown within the Interactive Legend.
To create and save a View Filter from within the Views tool in the Data Table, select which data fields you want to display in the table, choose sorting options, apply any filters, and save the view.

Previous saved Views will be listed at the top under My Views. Choose the view you want from the drop down and hit apply. If the saved View also had a filter applied as part of that View, it will then also appear in the View Filter drop down menu in the Interactive Legend.