howto/Tabs.md

@@ -3,7 +3,7 @@ windows with a specific function. This enables the user to access multiple featu
 in a dedicated view. All the tabs of the application can be accessed and turned off again
 via the `Window` menu entry.
 
-#### Chapters
+### Chapters
 
 * [Viewer](#viewer)
 * [PBC](#pbc)