Well before we move forward let’s clear one thing that there’s no setting given in Customizer to Add any FAQ , you need to make them in the Dashboard and then it will appear Automatically in the Live Demo. Now let’s see how it is Done.
In WordPress Dashboard go to FAQ Submenu and then click on Add New after clicking it you will reach to Add New FAQ page . After reaching here please follow this Screenshot for further tutorial :
In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize the theme Customizer page will appear .
Here You have to follow this Path : Go to Customize -> Page Templates -> FAQ Section
Now after reaching here you can Add Section Title & Description in FAQ Section in FAQ Page.
Then click on Publish.
Please follow this Screenshot for Reference :