I can´t find the GRID color for the floor (very easy)

Hello team. I can´t seem to define the color of the inner sections for each GRID DIVISION. The general grid changes color, but the smaller area squares remain the same.
Not on Overlay.
Not on Grid color.
Where could I change the color for those smaller squares?

Never mind. It´s the parameter with the cyan arrow. Just drag the ALPHA on the color.