I've already found it. You have to set the following text on web-client-config-custom.xml:
<!– The default location to display when the browse screen is first shown –> <!– This value should be one of 'myalfresco', 'userhome', 'companyhome' or 'guesthome' –> <config> <client> <initial-location>companyhome</initial-location> </client> </config>