Operations page should show scopes (global, regional, or zonal) as a column and/or in details page
Compute Engine > Operations page should have a column that specifies if the operation is Global, Regional, or Zonal. The API has three distinct methods: globalOperations, regionOperations and zoneOperations. The only way to tell which method the API should be calling is to view the operation details and see it in the URL. There isn't even a field in the details page to specify the scope.