This title received credit for modernizing some legacy interface issues:

Outside of games, the "interface" for the franchise's story is often criticized for its :

The interface for special moves was expanded from two to four slots, which reviewers felt added much-needed variety to the combat UI. General One Piece Presentation

Changing active characters in the field requires accessing sub-menus, which some reviewers found inconvenient and slow due to frequent screen fades. One Piece: Pirate Warriors 4: Functional Improvements

The UI is frequently praised for its vibrant aesthetic that matches the manga's tone.