Press on the button at the top to take a photo. The photo will appear on the scene and in the project's import folder as a JPG file: stuff/photos.
Turn on and off post effects.
Open the panel by pressing on the three lines button on the right side of the camera.
The camera in Pro has some additional controls to:
Turn on & off the post effects
Set the depth of field
Set the focal length in millimeters instead of degrees
Adjust smoothness of movements when recording in real-time
Adjust the sensor size
Change proportions of the screen