In a dryer, use a medium or hot setting, dry the linen by itself and don't over dry. Shake it out while still slightly damp and lay it flat. It will, by nature, have a soft, complex texture.
If you accidentally overheat, crowd or overdry your linen and it becomes wrinkled, dampen it and the wrinkles will relax. For a small wrinkle (where it was pegged on a line, for example) dampen with a spray bottle of water, or just let it relax by itself over a day or two.
If you can, line-dry, and let fresh air, wind, and sunshine do their work.