My 7 week olds are in and out of the coop all day long. Around dusk I bring them a bowl of cooked oatmeal (to keep them warm at night, it is slow to digest). They run in to eat their evening oatmeal and I close the coop door so they are in all night.
The first night they huddled on the floor, then they discovered the nest boxes so now they all huddle together in one of those (I lined one with a towel and then put a puppy pad over it to catch the mess).
That can be a hard habit to break down the road when laying starts - which leads to nasty nest boxes full of poo, not a great place to gather eggs from. It's generally a better idea to block the nest boxes until they are ready to start laying so they learn to roost on appropriate surfaces. Do you have roosts in the coop that are just too high for them at this point? If so, putting in a temporary roost (as simple as a couple of blocks and a pole/board/stick) up for them to use now will help.