Grids are horizontal and vertical lines that help you position items. You can display or hide grids and set preferences for grid spacing and appearance. When you display grids, they appear in all open image windows.
To display or hide the grid:
Choose View > Grid or press Ctrl + Alt + G.
To modify the grid:
Do either of the following:
Right-click the image’s title bar and from the context menu choose Change Grid, Guide, and Snap Properties.
Choose View > Change Grid, Guide, and Snap Properties.
Click the Grids tab.
The Default settings group box shows settings for all future grids you display. The Current image settings group box shows settings for the grid in the current image.
For either the default or current settings, select from these options:
Horizontal grids Sets the distance between horizontal grid lines (starting from the top of the image).
Vertical grids Sets the distance between vertical grid lines (starting from the left side of the image).
Units The unit of measure for positioning grid lines.
Color Click the color box to select a different color for grid lines.
Snap influence Controls how many pixels away an item must be to snap to a guide or grid. The Snap to Grid option must be selected in the View menu.