Use this activity to assign specific security groups to a permission set. You can access this option by clicking the Add button
on the Security Grants by Permission Set
page. Once you click the button, a dialog box will appear to select security groups.
Each app includes a predefined set of permissions that govern its functionality on mobile devices. If certain features are not used,
you only need to add the specific permissions required for those functionalities. Choose the necessary permissions to configure the app
according to your needs.
Refer
to the technical documentation for further details:
Security Groups by Permission Set
As a result of this activity, selected security groups will be added to a permission set.