diff --git a/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html b/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html
index 34c1f275..05fda023 100644
--- a/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html
+++ b/projects/ucap-webmessenger-ui-organization/src/lib/components/tree.component.html
@@ -8,6 +8,7 @@
     *cdkVirtualFor="let node of dataSource.expandedData$"
   ></ng-container>
   <mat-tree
+    fxFlexFill
     #orgranizationTree
     [dataSource]="dataSource"
     [treeControl]="treeControl"