How can I stop my mac from switching desktops when I receive a phone call When my phone rings the phone call shows up on my mac, which is great except that it also switches my display from the full-screen application to the main desktop screen.

Since the FaceTime popup is basically the same size and shape as a regular notification, is there any way to get it to pop up like other notifications instead of switching to the desktop and interrupting my work?
Assign it to either "All Desktops" or "None."  Right Click to access the context menu and then select "Options"

I have mine set to "None" and regardless of where I am, it does't switch but the notification pops up in the Notification center as expected.