To add websites to Trusted Zones via Group Policy, follow the below in Group Policy Editor.
Computer Configuration > Administrative Tools > Windows Components > Internet Explorer > Internet Control Panel > Security Page and then double click to the “Site to zone assignment list“.
Enable it, click Show, add website as value name and 1, 2, 3 or 4 as value.
- Intranet zone
- Trusted Sites zone
- Internet zone
- Restricted Sites zone
