Double tap the camera tab and choose one of the presets to expose the detailed camera control panel at the bottom of the screen.
Select the whiteboard view that best fits your needs from the presets labeled 1, 2, and 3 at the bottom right. Note: There are numbers applied to the whiteboards that correspond to the presets.
Preset 1 shows the best available whiteboard zoomed into the lower panel
Preset 2 shows the best available whiteboard zoomed out to show the stacked whiteboards.
Preset 3 shows the alternate whiteboard zoomed to the lower panel
