You can vary the width of the spray pattern by purchasing different airless spray tips with set widths (known as tip size or spray tip size). These can be bought on Amazon or from many local retailers.
As you gain more experience with painting with a sprayer, you'll find yourself able to use bigger spray tips for a bigger project size that get the job done faster. Spray tips have both fan widths, and orifice size measurements which can help control the paint flow.