Können Sie dieses CSS ausprobieren?
@include breakpoint(extra-large, $sidebar: true) {
.user-messages-page .topic-list {
.posts {
display: none;
}
.posters {
width: 146px;
text-align: inherit;
}
.last-post {
width: auto;
.poster-avatar {
display: none;
}
}
.topic-list-header .topic-list-data.activity {
width: auto;
}
.topic-list-data.posters {
a:not(.latest) {
display: inherit;
}
a.latest {
width: auto;
}
}
}
}