In the mobile application: 

For iOS devices:

1. Open the Zoho One app on your mobile device.
   
2. Tap in the bottom-right corner, then tap Security Policies.
   
3. Tap on the required security policy.
   
4. Tap in the top-right corner, then tap under Enforce to groups.
   
5. Select the desired groups, then tap  in the top-right corner.
   
6. Tap SAVE.
   

For Android devices:

1. Open the Zoho One app on your mobile device.
   
2. Tap in the bottom-right corner, then tap Security Policies.
   
3. Tap in the top-right corner, then tap next to Enforce to Groups.
   
4. Select the desired groups, then tap in the top-right corner.
   
5. Tap SAVE.
   

In the web application:

1. Sign in to Zoho One , then click Directory in the left menu.
   
2. Go to Security, click Security Policies, then click on the policy you want to configure.
   
3. Click under Applicable Groups, then select the desired groups.
   
4. Click Apply.