To rate files, right click and select a star on the context menu to apply a rating. To remove a rating, select the star with a line through it.
Files that are rated will appear in the Favorites listing in the left hierarchy. You can sort the files by rating by clicking the View menu in the upper right.
Ratings are shared across users, so every user in the Workspace will see the rated files. It’s a great way to mark files needed for a project or to showcase latest work.