You can add horizontal and vertical guidelines to your Page to help layout and position tables, charts, and other objects.
Method
To add the guidelines, click Show guides at the bottom of the screen.
This will add guidelines to the Page. You can move these around by hovering over them and then dragging them. You can duplicate a guideline by holding CTRL and dragging. If you right-click, you can select either Lock Guidelines or Delete.
Restoring Guidelines
If you've deleted all but one guideline and wish to restore them, right-click and select Delete on the remaining guideline. This will cause the original guidelines to appear.