Use this activity to revoke all security groups from a permission set. You can perform this option by clicking
the Revoke All button on the Security Grants Filters by Permission Set
page. Once you click the button, a dialog box will appear asking for confirmation to perform this operation. You
can choose either OK to proceed or Cancel to stop.
Refer to the technical documentation for further details:
Security Groups by Permission Set
As a result of this activity, all permission sets are revoked from a security group.