Edges rolling in

I knit a scarf with rows of 4 stich cable but the edges of my scarf roll inward.
is there anyway I can undo this without taking apart my scarf, i finished it and its really long.
also is there a reason my scarf is rolling inward? is there a way i can prevent this from happening in the future?

Thank you, any help will be great

Here is an entire thread dedicated to rolling stockinette.

If it’s done in stockinette st, then it naturally rolls. U might try crocheting around the edges since it’s complete. Or, picking up sts all the way around the scarf & doing garter st or another st pattern. In the future, it’s best to always make sure that St st isn’t on the outer edge of the project unless u want it to curl in the project :wink: