Once you are done working with an operation view, you can delete it from your account. To do so, you need to sign in to your organization in the browser. You can't delete operation views from within the Operations Dashboard app.
Using ArcGIS Online
Go to the ArcGIS Online home page to sign in: http://www.arcgis.com/home.
Using Portal for ArcGIS
Go to the home page of your portal to sign in. For example, https://maps.mycompany.com/arcgis.
Your organization's home page appears.
The operation view is deleted from your account and is no longer available to anyone with whom it had been shared.