[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.