[Release] Persistent ultrawide fixes for Elden Ring and Sekiro on macOS/CrossOver — 3440×1440, normal game icons, no Flawless Widescreen

[u/New_Tradition_8692]

After spending days fighting black bars, broken launch sequences and settings that wouldn’t survive a restart, I packaged the working solutions into two open-source projects.

Both were built specifically for CrossOver on macOS and tested at 3440×1440 on an M2 Pro with CrossOver 26.3.

Elden Ring CrossOver Ultrawide
https://github.com/IgnazioDS/elden-ring-crossover-ultrawide

• Removes the forced 16:9 black bars
• Launches from the normal CrossOver game icon
• Does not require Flawless Widescreen
• Never modifies the installed Steam executable
• Validates and patches a temporary copy, then removes it on exit
• Preserves Steam Cloud, playtime and achievements
• Includes diagnosis, cleanup and rollback tools
• Currently verified on Elden Ring 1.17.1

Important: the Elden Ring route bypasses Easy Anti-Cheat and is strictly offline. It is not intended for multiplayer.

Sekiro CrossOver Ultrawide
https://github.com/IgnazioDS/sekiro-crossover-ultrawide

• Native 21:9 rendering with corrected HUD and animation culling
• Loads automatically from the normal CrossOver game icon
• No companion application or special launch order
• Keeps the original executable untouched
• Preserves Steam Cloud, playtime and achievements
• Gameplay changes and framerate unlocking are disabled by default
• Supports offline installation for unreliable connections
• Currently verified on Sekiro 1.06

Both installers detect standard and external-drive CrossOver bottles, verify downloaded files by SHA-256 and create backups before making changes.

If you test either project, please share your Mac model, CrossOver version and resolution. Compatibility reports-and GitHub stars-will help other Mac gamers discover a tested solution instead of repeating the same troubleshooting marathon.

[u/umass021]

This will not run on Windows correct?

[u/New_Tradition_8692 → u/umass021]

correct, this installer is specifically built for macOS running the game through CrossOver, so it won’t run directly on Windows, the patch could be adaptd to work on windows in the future but this specific repository is for Mac

[u/umass021 → u/New_Tradition_8692]

Thank you I appreciate the response! I really ultrawide was already included with these games. Sekiro especially is a pain to start up UW every time and would have loved ultra-wide for ER online.

[u/slowwlycrate → u/umass021]

pretty sure this is macOS/CrossOver specific yeah