Use this activity to revoke all security groups from a permission set. You can access this option by clicking
the Revoke All button on the Security Grants 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 security groups will be revoked from the permission set.