diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/grid/AbstractBrowserGrid.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/grid/AbstractBrowserGrid.java
index 7ceee5c8ea418ea159e8e41fd318fd6b774775b8..8ab6abf1ac0d73e27eae0195f2c94b39113c991d 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/grid/AbstractBrowserGrid.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/grid/AbstractBrowserGrid.java
@@ -390,7 +390,7 @@ public abstract class AbstractBrowserGrid<T/* Entity */, M extends BaseEntityMod
 
         final LayoutContainer subContainer = new LayoutContainer();
         subContainer.setLayout(new RowLayout(Orientation.HORIZONTAL));
-        subContainer.add(tree, new RowData(200, 1));
+        subContainer.add(tree, new RowData(250, 1));
         subContainer.add(this, new RowData(1, 1));
         container.add(subContainer, new RowData(1, 1));