Deleting Filter Groups and Filters in Smart Content Filter is very simple. Here’s how to do it:
Go to your post editor and scroll down to the Smart Content Filter section. Here, you will be able to see the Filter Groups and the Filters you have created.
To delete a Filter Group, click on the X icon on the top right of the Filter Group heading. To delete a Filter, expand the Filter Group and click on the X icon (in the top right) to delete the Filter.