diff --git a/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx b/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
index 4069bc68f..82aac7bd1 100644
--- a/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
+++ b/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
@@ -35,9 +35,11 @@ function PanelStudyBrowser({
 
   const [{ activeViewportId, viewports, isHangingProtocolLayout }] = useViewportGrid();
   const [activeTabName, setActiveTabName] = useState(studyMode);
-  const [expandedStudyInstanceUIDs, setExpandedStudyInstanceUIDs] = useState([
-    ...StudyInstanceUIDs,
-  ]);
+  const [expandedStudyInstanceUIDs, setExpandedStudyInstanceUIDs] = useState(
+    studyMode === 'primary' && StudyInstanceUIDs.length > 0
+      ? [StudyInstanceUIDs[0]]
+      : [...StudyInstanceUIDs]
+  );
   const [hasLoadedViewports, setHasLoadedViewports] = useState(false);
   const [studyDisplayList, setStudyDisplayList] = useState([]);
   const [displaySets, setDisplaySets] = useState([]);