Just follow these steps to force close the CBS app:

1. Return to the “Home” screen by pressing the “Xbox” button to open the One Guide, then select “Home.”
2. Verify that the big application tile is highlighted, and then press the “Menu” button on your controller.
3. Using the directional buttons on the Xbox One controller, select “Quit.”

Relaunch the CBS app!

Note: If the problem with your game or app is causing the console to be unresponsive, power cycle your Xbox One console instead by visiting https://support.xbox.com/en-US/xbox-one/console/power-cycle-console.