If your linens have shrunk in the dryer, it's unlikely that you'll be able to fully reverse the shrinking process through ironing alone. Once fibers in fabrics have been permanently altered due to heat exposure, they cannot revert to their original length or shape. However, you can still try the following steps to make the linens more manageable:
Dampen the linens: Lightly mist the shrunken linens with water using a spray bottle. The moisture can help relax the fibers and make them more pliable.
Stretch and reshape: Gently pull and stretch the linens in the direction opposite to the shrinkage. Be careful not to tear the fabric, especially if it has become brittle due to heat exposure.
Iron with steam: Use a steam iron and select the appropriate setting for the fabric (cotton, linen, etc.). The steam can further help relax the fibers, and the heat can smooth out wrinkles. Remember to use a pressing cloth to protect the fabric from direct contact with the iron.
Avoid high heat: Don't use excessively high heat settings, as they can damage the fabric further or even cause scorch marks.
Air dry: After ironing, allow the linens to air dry flat to help them retain their new shape.
Keep in mind that these steps might not fully restore the linens to their original size, but they can help make them more presentable and comfortable to use. In the future, to prevent shrinkage, try using lower heat settings when laundering linens and avoid over-drying them in the dryer. It's also a good idea to check the care instructions on the linens' labels to ensure proper care.