The left rail is gone. The page shows results full-width with a removable active-filters bar; Edit filters opens a full-height builder drawer. Same sample filter: CA/TX licensed · Life · (email “agency” OR has phone) → 12,431.
No left rail → the table gets the full width. Applied filters show as removable chips; click any chip or “Edit filters” to open the builder.
Full-height, roomy. Add filters via a searchable field picker (source-aware), build and/or/NOT groups, and read the live count + plain-language preview at the bottom. This is where Phase B (save, share, “which clause killed it”) will attach.
Faithful to your tokens (Inter · primary hsl(221 83% 53%) · slate-900 nav · real Button/Badge/Sheet styles). Wireframe-level, not pixel-final. React freely — drawer width, where count/preview sit, the active-filters chip style, whether quick-adds should still live on the page. No decision required.