The surrounding gray area of the model is the canvas background.
The canvas background color and gradient can be customized in User Settings > Canvas.
A thumbnail preview of your model to display silhouette and support sculptural improvements.
Press and drag inwards & outwards on the thumbnail image to change the window size.
Thumbnail can be turned off in the User Settings > UI menu.
CamView display and controls.
CamView links to the ZBrush camera, offering orientation clarity when using touch or pencil to orbit around the model.
Tap the cones connected to CamView to snap the camera along the selected x (red), y (green), or z (blue) axis plane.
CamView Snap To XYZ
When using the default symmetry settings in ZBrush, if your model is not facing the same direction as the CamView head, modeling and symmetry results may be undesirable. Tap Gizmo3D and rotate your model to align with the CamView head.
Learn how to use Gizmo3D to rotate, scale, and position a model in this guide's Gizmo 3D Essentials section.