The left side of the FaceTime window shows you all the calls you’ve made or received (unless you deleted your call history). It’s organized by date, with the most recent calls on top.
The Upcoming section appears when you create a link for a FaceTime call or when a link is available in Calendar, Reminders, Mail, or Messages. These links appear in the Upcoming section for a day or so; otherwise, they appear in the date-based section—for example, Last Week.
In the FaceTime app
on your Mac, move the pointer over the call window, then click the Video button or the Audio button next to a call. (You can also click a call in the sidebar, then use the Touch Bar.)
on your Mac, move the pointer over the call window, then click the Video button 
or the Audio button 
next to a call. (You can also click a call in the sidebar, then use the Tip: A Group FaceTime call remains active until all participants leave the call. To join or rejoin a Group FaceTime call that’s still in progress, click the Join Video button 
or the Join Audio button 
.
