using script

[keerthi35]

We would like to hide 'Onboarding' requests from all agents who are not members of a Assignment Group

[Saurabh Gupta]

Hi,
You can write before query BR to achieve the same. ACL can also be checked.
Business Rules | ServiceNow Developers
Before Query Business Rule Vs ACL - Support and Troubleshooting (servicenow.com)