Contacts and Companies in "Show in other apps" lists cannot be shared with other Daylite users as they are user-specific.
By enabling this option from the Daylite Preferences > Contact Integration, you can share specific contacts and companies added to these lists with Apple Contacts and other apps on your Mac and iOS devices. To set this up, please take a look at the steps for Contact sharing here.
To share contact and company lists with other Daylite users, you can use Smart Lists. For steps on setting up and sharing Smart Lists with other Daylite users, please click here.