Use this activity to grant all security groups to a permission set for all mobile apps. You can access this
option by clicking the Add 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 are added to a permission set.