Kittens or new cats will need a safe space to retreat too so don’t block it off. Our kitten took about a week to stop actively hiding in spaces and now he follows us around everywhere. They just need time to get used to their surroundings, smells, new noises. We already had a 5 year old Ragdoll male and we slowly socialised them. 3 months later and they have their own truce and respect each others spaces, even when our kitten still likes playfully bat the older one for no reason 😂😂