# cat /etc/xdg/xfce4/xfconf/xfce-perchannel-xml/thunar-volman.xml
<?xml version="1.0" encoding="UTF-8"?>

<channel name="thunar-volman" version="1.0">
  <property name="automount-media" type="empty">
    <property name="enabled" type="bool" value="true"/>
  </property>
  <property name="automount-drives" type="empty">
    <property name="enabled" type="bool" value="true"/>
  </property>
  <property name="autobrowse" type="empty">
    <property name="enabled" type="bool" value="true"/>
  </property>
  <property name="autoopen" type="empty">
    <property name="enabled" type="bool" value="true"/>
  </property>
</channel>