, click 
to enter the Analyze mode, right-click 
, and select Rulers and guides.
Rulers and guides help you position the elements in your application.
To use rulers and guides, in the Preview select the Node tool , click to enter the Analyze mode, right-click , and select Rulers and guides.
To add a guide, in the Preview select the Node tool and drag a ruler to the preview area. Drag from the horizontal ruler to add a horizontal guide, and from the vertical ruler to add a vertical guide.
Use the Snap tool to snap an element in your application to a guide. To enable snapping, in the Project select a 2D node, in the Preview select the Node tool , and select 
. When you move 2D node in your application, it snaps to the nearest guide.
To move a guide, in the Preview select the Node tool and drag the guide you want to move.
To remove a guide, in the Preview select the Node tool , drag the guide, and drop it on the ruler.
To remove all guides, in the Preview select the Node tool , right-click one of the guides, and select Delete all guides.
Editing your application in the Preview
