To remove all end-user configured custom access rules for a zone
Navigate to POLICY | Rules and Policies > Access Rules.
Click the Zone Matrix Selector icon or use the From Zone To Zone options to select All Zones or a specific zone combination.
Click the Reset Rules icon at the top of the table. This restores the access rules for the selected zone combination to the default access rules initially set up on the firewall and added by SonicOS. A confirmation message displays.