diff --git a/ui/src/views/Baseline.jsx b/ui/src/views/Baseline.jsx
index 7b363d4..7913c78 100644
--- a/ui/src/views/Baseline.jsx
+++ b/ui/src/views/Baseline.jsx
@@ -98,7 +98,11 @@ export default function Baseline({ sources = [], sourceId, versions = [], versio
   useEffect(() => {
     if (!sourceId) return
     fetch(`/api/sources/${sourceId}/cols`).then(r => r.json()).then(cols => {
-      const fc = cols.filter(c => c.role === 'date' || c.role === 'filter')
+      // What a load is filtered by and what the pivot groups by are separate
+      // concerns: a dimension is exactly the sort of thing a segment is cut on
+      // (sseas, channel_new), and forcing it to role 'filter' to get it here
+      // would cost it its place on the pivot. Only measures are excluded.
+      const fc = cols.filter(c => ['date', 'filter', 'dimension'].includes(c.role))
       setFilterCols(fc)
       setFilters(fc.length > 0 ? [emptyGroup(fc)] : [])
     })