Grid modes provide a number of options for how to display grids and levels in the Scene View.
. Displays the active grid on the levels directly above and directly below the camera position.
. Displays the active grid on the level directly above the camera position.
. Displays the active grid on the level directly below the camera position.
. Displays the active grid on all available levels.
. Displays the active grid on a single, user-specified level.
.