Steam Deck

You'll install FO on your Steam Deck via Prism Launcher.

1. Hold down the Power button on your Steam Deck

2. Tap on Switch to Desktop

3. Select Discover from the taskbar

4. Tap the Search bar on the top-left corner

5. Tap the X to open the on-screen keyboard

6. Search for Prism Launcher

7. Tap Install on the first result

8. Launch the Prism Launcher

9. Go through Prism Launcher's initial setup process

10. Close Prism Launcher

11. Open the Steam app

12. Tap on Games, then on Add a non-Steam game to my library, then select Prism Launcher, then tap on Add selected programs

13. Close the Steam app

14. Launch Return to Gaming Mode

15. Launch Prism Launcher from your game library

16. Follow the instructions for the Prism Launcher. Once you've opened Minecraft, come back here

17. Tap on Options..., then on Controls..., then on Controller Settings...

18. Select your controller

19. Tap on Done three times

20. You can launch the game from your game library from now on

21. If you want a better icon in your game library, follow the instructions for setting up artwork

If you get Deck-related issues, try asking on r/SteamDeck on Reddit. FO moderators might not be able to help you.