You can filter a table or view by the control's value using the Matches function. This makes it easy to match not just on exact values, but also for lists and ranges.
Simply click the filter icon to apply your formula of choice to your table.
In the example above, the formula we're using is:
=Priority.Matches(thisDocument.PrioritySelect)
- Priority is the priority column of the Task List table
- PrioritySelect is the name of the dropdown menu control