diff --git a/debye_bec/bec_widgets/widgets/data_viewer/viewer.py b/debye_bec/bec_widgets/widgets/data_viewer/viewer.py
index 50a1d9c..93312fe 100644
--- a/debye_bec/bec_widgets/widgets/data_viewer/viewer.py
+++ b/debye_bec/bec_widgets/widgets/data_viewer/viewer.py
@@ -368,6 +368,7 @@ class HDF5Viewer(QMainWindow):
         left_layout = QVBoxLayout(left_pane)
 
         self.tree = QTreeWidget()
+        self.tree.setMinimumWidth(250)
         self.tree.setHeaderLabels(["Name", "Type", "Shape"])
         self.tree.header().setStretchLastSection(False)
         self.tree.header().setSectionResizeMode(0, QHeaderView.ResizeMode.Stretch)