Linen always requires plenty of water from the washing machine. It’s best to only hall-fill the machine. The material shrinks slightly as soon as it comes into contact with water. But don’t worry, its shape will automatically return when you iron it.
Speaking of ironing, linen items should still be a little bit damp when you iron them. Alternatively you can dampen the material a little beforehand.
Beware of lime! Linen does not like hard water or lime residue on the iron. It leads to stains, so try to avoid both.