6 month old cries when I stay in room

Kayla

So we’ve recently started CIO with my 6 month and it’s actually worked wonders. He only cries for a few minutes and then he’s sleeping 12 hours. If I put him in the playpen and leave the room, he’s fine. But if I try to stay he will just cry and cry until he gets picked up. Is there anything I can do to get him ok with me being in the room while he plays? We have a small apartment and I work from home so my computer desk is in the bedroom as well. I don’t want to move him out of the room yet either.