Instructions
Go to Google's Looker Studio and open the Looker Studio Report you are working with
Click the Edit button

Click on the table you would like to apply a filter to
Scroll towards the bottom of the Chart column and click + Add a Filter

Select Create a Filter

Create your filters to include or exclude certain dimensions. You can also select from many operators to determine the content that is shown in the filtered table.

Note: In the example above, we want to show Page Titles that contain the term News Flash.