Hello 
Yeah, that’s possible relatively easily with modifying some CSS.
However it depends on what the following meaning exactly:
I assume you forked the theme and as I remember everything what you need to do this in the
scss/desktop/fkb-d-topic-list.scss file. There you will see the .has-sidebar-page class which is the breakpoint in the two separate style. Actually, you have to compare the .list-controls. I’ll can make a PR if you have a forked version…
Hello Sorry for the late reply. Yeah, that’s possible. But the Highest-Post Excerpts in Topic List plugin is required. I think I’ll built this setting…
Note: I’ll have to modernize the template to be compatible with the new Glimmer topic list. This process may change things compare the current theme. So if you modify the theme, the new version may will break your changes…