Baseline (Widescreen) Solution & Issues
The Games Developed by Omega Force are only designed for 16:9 - this Game does not support higher resolutions than 1920x1080. And 16:10 or 4:3 resolutions are not available.
To get higher resolutions you need the Program CheatEngine. I created a Fix "One Piece Pirate Warriors 3 - Widescreen.7z" where you can manually set your width,height and aspect ratio.
Now run the Game, alt Tab and change the Values in the CheatEngine then alt tab back to the Game, go in the Graphic Options and switch to Windowed Mode. You should see by now the new Resolution, now switch back to Fullscreen.
Important Note: DO NOT change the resolution in the Game Options - this Fix is based on 1280x720/720
I preconfigured the CheatEngine FIX: F1 = 2560x1080 / F2 = 3440x1440 / F3 = 5760x1080 / F4 = 3840 x 2160 . files available from the PC Gaming Wiki Community Files (search there).
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Same Solution as in Widescreen.
Eyefinity / Surround Specific Solution & Issues
Same Solution as in Widescreen but the Menues are terribly stretched.
4k UHD Specific Solution & Issues
Same Solution as in Widescreen.