Hello! I understand you're having trouble with the France 24 live stream on your Fire TV, where the video plays in a small window rather than full screen. Let's work together to get that fixed.

First, can you tell me a bit more?
- Does this happen only with the France 24 app or with other apps as well?
- Have you already tried any steps to fix the screen size?
- Also, what Fire TV model are you using?

Meanwhile, here are some common steps to try adjusting the screen size on a Fire TV device:

1. Calibrate Display on Fire TV
- From the Fire TV home screen, go to Settings > Display & Sounds > Display > Calibrate Display.
- Follow the on-screen instructions using your remote to adjust the display until the arrows fit just inside your TV screen edges. This often solves issues where apps do not go full screen correctly.

2. Check the TV’s Aspect Ratio Settings
Sometimes the TV’s own display aspect ratio can cause the image not to fill the screen.
- Using your TV remote, open your TV’s picture or display settings.
- Look for terms like Aspect Ratio, Screen Format, Zoom, or Picture Size.
- Set it to 16:9, Full, or Just Scan depending on your model. Avoid settings like Zoom or Wide that may distort the image.

3. Restart the France 24 App and Fire TV
- Close the France 24 app completely and reopen it.
- Restart your Fire TV device by going to Settings > My Fire TV > Restart.

4. Update the France 24 App
- Ensure your France 24 app is updated to the latest version.
- Go to the app in the Fire TV store and check for updates.

If after trying these steps the live stream still plays in a small window, it might be due to how the app handles video scaling internally. Some apps don't fully support full-screen playback on Fire TV without a specific app update or fix.

Let me know how the calibration and settings go, and if you see this issue on other streaming apps too. We can then explore more advanced fixes if needed.

Are you comfortable trying these steps?