1. Power on your Xbox One console and press the Xbox button on your controller, then scroll and select “Settings.”
2. In “Settings,” scroll down until you reach the “System” tab, then select “Cortana settings,” located on the right hand side of your screen.
3. Select “Cortana can give you suggestions, ideas, reminders, alerts, and more” and press “A” on your controller to deselect this option.
4. Afterward, you can select to restart your console. Once your console restarts, Cortana will be officially disabled on your Xbox One.