QuarkXPress lets you create a “magnetic field” around guides so that when you drag an item close to a guide, it automatically aligns with it. This feature is called Snap to Guides (View menu) and the width of the magnetic field is called the Snap Distance.

To control snapping with QuarkXPress controls, make sure View > Snap to Guides is checked. To specify the distance, choose QuarkXPress/Edit > Preferences > Print Layout > Guides & Grid and enter a pixel value in the Snap Distance field.

You can also choose View > Snap to Page Grids to force items to align with the master page grid. The value in the Snap Distance field applies to master page grids as well. For more information, see “Snapping items to design grids.”