Allows you to set a list of site url patterns that specify sites which will automatically deny the window placement permission. This will limit the ability of sites to see information about the device's screens and use that information to open and place windows or request fullscreen on specific screens.
For detailed information on valid site url patterns, please see https://cloud.google.com/docs/chrome-enterprise/policies/url-patterns. Wildcards, *, are allowed. This policy only matches based on origin, so any path in the URL pattern is ignored.
If this policy is not set for a site then the policy from DefaultWindowPlacementSetting applies to the site, if set, otherwise the permission will follow the browser's defaults and allow users to choose this permission per site.