You can set Interval and Applied axis of the grid when snapping to grid is enabled in [Edit option].
Plane snapping
You can select the plane to snap when snapping to plane is enabled in [Edit option].
Click [Get from a select face], you can get position of the plane from current selected faces.
Mesh displaying
Size and Interval of each mesh, YZ / ZX / XY plane, can be set. [Auto] is checked, the value will be set automatically according to the field of view.
Lighting Settings
The color and direction of the light source and Matcap are set. You can set the same setting with [Lighting] in the command panel.