Double knitting

I’m trying to make a scarf by double knitting, but I just have a question. Are the sides supposed to be open? I want them to be closed, but I am not sure how to do this. Any help you could give me would be really appreciated! Thanks!

I believe that they are separate, but I could be wrong here. I think you bind them off together at the end to close them.

Yes…double-knitting creates two separate sides, but they will be interconnected where you cast on and bind off…and also wherever you switch the colors around to create any pattern.