Currently, you can filter the “Priority” column by “All Labels” or “What’s Done.” There is no way to filter the “Summary Row” (the row at the end of the column showing a mix of the various colors assigned by label (e.g., low, medium, high)) by what is currently in progress.
When my groups are minimized on my board, I want to be able to see the colors in the Summary Row for only what Projects are in progress (i.e., not marked as “done”).