As I do all my work on a Mac laptop, perhaps I am missing something here by not having a mouse and full keyboard. However, assuming you are using the explore mode, the default shortcuts are:
"space bar" to raise the camera
"C" to lower the camera
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K