[Notifications won't go away on their own]

EXCELLENT! Thank you for both responses Nukecad and Nergal! I've employed both suggestions. So THAT'S what that thumbtack is for!! Ha!! 

Thank you again! :) 

[Notifications won't go away on their own]

We've been using CCleaner for several years and anytime a notification would come up letting me know about a particular action such as "Browser cleaned," it would fade out a few seconds later, which was great so as not to cover up part of the application windows I was working in underneath the CCleaner notification. Now the notifications stay up until I manually close each one which is annoying. Is there a way to go back to having all notifications fade out after they come up?