Interacting with Apps
Apps which are running in the foreground or the Recent can be terminated at any time. To close an app, hover over the app title. "X (close)" close button will be shown next to the app title. Click the "X (close)" button to terminate the app.
Or, hover over one of the Recent cards in Recent UI or the app tile in Home UI. The "X (close)" button will be shown on the top of the card/tile. Click the "X (close)" button to terminate the app.
Apps in the installed list can be removed from the webOS TV in Edit Mode. Long press the app tile to start Edit Mode and once an "X" button is clicked, then the confirmation will ask you again to remove the selected app. If selecting yes, the chosen app is deleted.