The dialog box has two tab pages.
Grid Type - Set the grid display as either 'lines' or 'dots'
Grid On - A toggle switch to turn the grid display on or off. Alternatively use the button on the System Toolbar.
Visible Grid - X & Y offset values for the spacing of the visible grid. This sets the distance between the visible grid points horizontally and vertically. The visible grid settings are totally independent of the snap grid, but can be set to the same values if required.
Snap Grid - X & Y offset values for the spacing of the snap grid. This sets the distance between the snap grid points horizontally and vertically.
As shown in the dialog box above you can define the X and Y spacing independently for both grids.
In these versions an an 'Isometric Grid' option is added, the dialog box will look as follows:-
When selected the dialog appears as shown below.
In the options area the system IntelliSnap and Angle Lock features can be turned on/off.