Hello:
I’m afraid there is no option to automatically mark all as read. However, you can at any time select all and choose Mark As Read.
I will move this thread to the Suggestions forum for you; this is the best place to make your voice heard when it comes to anything you may want to see included in the software. While posts made to this forum are rarely replied to, each one is read by our development staff for consideration for future program updates. We appreciate your comments and your willingness to help make our products better for all users.