authentication.visible=false to authentication.visible=true.
Save the file and Copy this file in C:\Program Files (x86)\SAP BusinessObjects\SAP BusinessObjects Enterprise XI 4.0\warfiles\webapps\BOE\WEB-INF\config.
Now go to Central configuration Manager and restart the Tomcat.
NOTE: From SAP BusinessObjects Business Intelligence Platform 4.3 onwards BILaunchpad.properties file is replaced by FioriBI.properties file. That is from 4.3 onwards above changes to be done in FioriBI.properties file.