The UV grids are independent of one another and can be turned on and off as needed. By default, both U and V grids are on when a surface is initially divided.
U grids
Click Modify | Divided Surface tab
UV Grids and Intersects panel
U Grid. Click again to enable.
V grids
Click Modify | Divided Surface tabUV Grids and Intersects panel
V Grid. Click again to enable.
