The wording on whether furniture is usable by NPCs needs clarification. As it stands, putting a green checkmark in the option means they are prevented from using it. This is counter intuitive as green checkmark usually enables something instead of preventing it, while the red X blocks or denies something.

The setting doesn't appear to entirely work either...  I've had servants standing around a table when it went off before, it still seems to affect them even if I've forbidden them to use it using that setting.  I guess what it does is stops them from walking over to the Prop & interacting with it directly, but that setting doesn't seem to affect Props that have an AoE buff/debuff that gets applied just being near it with a recurring refresh rate (doesn't look like the toggle to disable it works either).