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Using A Grid
 
The grid is a network of horizontal and vertical lines that covers your design area.
The 'Show Grid' and 'Snap to Grid' checkboxes allow for more precision in positioning Elements on your form.
The 'Show Grid' option makes the grid appear, whereas the "Snap to Grid" pulls the Element selected into alignment with the nearest intersection of grid lines.
These 2 options are best used together, but can activated separately as well.

Steps to use the grid:

1)  Check the 'Show Grid' and 'Snap to Grid' options in the "Element Toolbar".

Show and Snap To Grid

2) 

Determine the space between the vertical and horizontal lines in the "Form Settings" box.

Vertical and Horizontal Snap

3) 

Drag an element and let go (drop) it somewhere in the design area.
Notice that while holding the element a Blue corner will appear, indicating the closest intersection of grids, where the element will be snapped to if you let it go.

Snap

4) 

The element will then align to the nearest intersection of grid lines.

Snap