Synametrics Technologies

I assume you're referring to SynaMan. Use the following steps to configure this.

• Stop SynaMan
• Locate AppConfig.xml file in $INSTALL_DIR\config folder. $INSTALL_DIR is usually set to C:\SynaMan\config in Windows and /opt/SynaMan/config on Linux.
• Make a backup of the file in case you need to rollback
• Modify the file and add the following towards the end:
  
  <parameter name="publicLinkExpIndex" type="2" value="8"></parameter>
  The value corresponds to the selected index, which starts from 0. An 8 in this value will correspond to 1 Month as the default.
  
  
• Save the file and restart SynaMan