Brightness (2.0)

This is the easiest way to change the exposure in the frame. If you right-click anywhere within the preview screen of the connected device, it will drop an exposure marker. The marker appears as a yellow box. Right-click in another location to move the marker. The Brightness will adjust depending on where your marker is placed. 

Tip: If you bring the exposure marker to a blown out light source, you will see the shot will become very dim, bringing down the intensity of any lights. If you bring the exposure marker to a darker source in the frame, you will see the shot will become very bright and possibly over-exposed.

2. From the Camera Settings Panel

Click the 3 lines in the upper left corner to expand the panel and select Brightness. 

Move the slider left or right to adjust. 

You can toggle AE Lock to the on position to lock in the settings. You will see the exposure marker change to a red color when this setting is on.