What is "pop-up view"?

"Pop-up View" enables a pop-up card of appointment detail when mouse over the appointment. You can turn it on or off anytime. If you have too many appointments on one screen, it might cause longer time to fully load the page.

source: https://www.facebook.com/photo.php?fbid=318170582141671&set=gm.459192891281550&type=3&permPage=1&ifg=1