Is it possible to make a category sticky, and always appear at the top?
If you are a staff member (Admin or Moderator) you will have access to the topic admin wrench. On desktop this can be found on the right of a topic or at the bottom. On mobile you will find it at the bottom right next to the topic time line.
Once located press ‘Pin Topic’. If you want a topic to be pinned and always appear at the top select ‘Pin Topic Globally’