You can set spacing between grid lines by choosing from a range of preset measurements (1/16", 1/8", 3/16", 1/4", 3/8", or 1/2"). The grid includes an option called "Snap to Grid", which aligns objects to the nearest intersection of the grid or to another object as you draw or move objects. You may also adjust the rotation (1, 2, 5, 10, 15, 30, 45, or 90 degrees) When Snap to Grid is set, each time you move or rotate an object it will move only the amount you specified.
This feature is useful for creating specific layouts. It's not hard to use - just try it out and play with it. You can easily set the grid and turn it off as needed while you work on a project. Be sure to choose "Snap to Grid" and then click "OK" after you have set the grid increments that you want!
The final feature found on the View ribbon is the Screen Layout, which allows you to view the Photos panel as a separate panel at the bottom of your screen rather than on the right hand side of the screen (the default view). Simply click the second screen layout icon in the Settings section of the View ribbon. To return to the default view, click the first icon.