Ah yes, so you now get defect suites as a column option in a custom list of all defects. And it seems that defects suites is not available as a filtering option to improve your view. It seems that "Defect Suite" is not an attribute of a defect instance. It also means you can't build a proper query.
Well, so far I have two lifehacks in my mind =) First one - export all the list to CSV and perform filtering in MS Excel. And another idea is to utilize additional parameter. To be more detailed:
1. Quality > Defect Suites. Here you can see all defects that are assigned to suites (opposite view to those you need).
2. Using bulk actions tag all these defects by any label, e.g. "ds"
3. In the custom list app filter by tags (e.g., Tags != ds)
Let me know if it helps or not