diff -ur canorus-0.7.3svn20190105.orig/src/ui/mainwin.ui canorus-0.7.3svn20190105/src/ui/mainwin.ui
--- canorus-0.7.3svn20190105.orig/src/ui/mainwin.ui	2019-04-22 03:11:04.000000000 +0300
+++ canorus-0.7.3svn20190105/src/ui/mainwin.ui	2019-04-22 04:40:17.055458072 +0300
@@ -533,6 +533,9 @@
    <property name="text">
     <string>&amp;User's guide...</string>
    </property>
+   <property name="visible">
+    <bool>false</bool>
+   </property>
   </action>
   <action name="uiWhatsThis">
    <property name="enabled">