The guideline grid on page spreads can be customized to fit your needs! You can:
1. Set the grid size to 1/16", 1/8", or 1/4"
2. Set the color of the grid lines
3. Turn Snap To Grid ON or OFF (if this is turned on all of the photos will snap to the grid lines when moved)
Select the grid tab on the upper right corner of the page spread and the grid options will open.