If you're noticing that your Xbox screen is stretched, it's likely because your TV isn't set to the correct display resolution. To fix this, you'll need to go into your Xbox One settings and adjust the display resolution. Here's how:
1. Press the Xbox button on your controller to open the guide.
2. Select Settings.
3. Select Display & sound.
4. Under Video output, select Video modes.
5. Select 720p or 1080p for HDTVs, or 480p or 576p for standard TVs.
once you've selected the correct resolution for your TV, your screen should no longer be stretched!