Board Thread:Support Requests - Designing Your Wiki/@comment-4530178-20180405082530/@comment-24142930-20180405092300

.wds-community-header__sitename a { display:none }

Would work, although I couldn't see that CSS anywhere on the One Piece Wiki, they may have used something different. As Andrewds1021 stated though, it must be in violation of the customization policy though.