Admin reference for enabling F&O virtual entities in Dataverse - https://experience.dynamics.com/ideas/idea/?ideaid=5a367fe0-b8cd-eb11-ba5e-0003ff45ac2b - makes it clear that each entity that the administrator wishes to enable must be opened individually & made visible with its own checkbox. From a user experience perspective, it would be (significantly?) quicker if the "Available Finance and Operations Entities" results lists had the visibility checkbox editable in-grid to allow for multiple entities to be made visible as one action.