diff --git a/org.fortiss.tooling.ext.quality.ui/plugin.xml b/org.fortiss.tooling.ext.quality.ui/plugin.xml
index da353e8224ff71134684741b8701639102fbc507..25a97df238a3d86523d74dabc4fe8c3127c2da83 100644
--- a/org.fortiss.tooling.ext.quality.ui/plugin.xml
+++ b/org.fortiss.tooling.ext.quality.ui/plugin.xml
@@ -8,14 +8,14 @@
             contributor="org.fortiss.tooling.ext.quality.ui.ModelQualityExtractionMenu">
       </contextMenuContribution>
    </extension>
-   <extension
-         point="org.eclipse.ui.views">
+   <extension point="org.eclipse.ui.views">
       <view
             class="org.fortiss.tooling.ext.quality.ui.view.fx.ModelQualityFXViewPart"
             icon="icons/metric.png"
             id="org.fortiss.tooling.ext.quality.ui.metricsView"
             name="Metrics"
-            restorable="true">
+            restorable="true"
+            allowMultiple="false">
       </view>
    </extension>
 </plugin>
\ No newline at end of file