Account limitations are a way of restricting the access of Orion user accounts to specific network objects, such as nodes, interfaces, groups, maps, or alerts. You can use account limitations to limit a user to only monitor Windows servers and not be able to view other devices that NPM monitors. For example, you can create a custom limitation based on the node property Operating System, and select only Windows as the value. Then, you can apply this limitation to the user account or user group that you want to restrict. The other options are not effective ways of limiting user access to specific devices, as they either affect the visibility of the entire view (view permissions), the layout of the view (account views), or the scope of the alerts (alert limitations). References:

Limit user access to network areas with account limitations

Create custom account limitations