The following steps should be followed in order to create the “Read Only” access:
1. Create a new role in vSphere. In vSphere client’s menu bar navigate to View-> Administration -> Roles.
2. Create a designated role and select the desired privileges for that role. Uncheck all Zerto privileges except the “Viewer” checkbox.
3. Navigate to the permissions tab on vSphere client and right click the desired user/group. Then choose the properties option to add the new role to the relevant user.