I don't want to launch CyberLink YouCam and have system tray icon display when log in to Windows. What can I do?

If you don't want to have YouCam icon display in system tray when you log in to Windows, go to Setting > UI Settings > Disable Show system tray icon at startup.

Note: if you have enable Face Login to Windows and Face Out features, then YouCam will always display in the system tray.