The timeslot that THE VIEW is in is perfect for Barbara's schedule. And it's LIVE. If they were going to move to 4pm, then it probably wouldn't be a live show anymore, losing some of its appeal. And Barbara would appear less.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle