Something recently changed, can't increase `--topic-body-width`

By default, this is in core if you don’t use D-TOC. :arrow_down_small:
So you can revert this percentage changes with this.

@media screen and (min-width: 925px) {
  .container.posts {
    grid-template-columns: auto auto;
  }
}

Or you can make wider the post section with changing the percentages. For example;

@media screen and (min-width: 925px) {
  .container.posts {
    grid-template-columns: 80% 20%;
  }
}