Of course! You can preview your show in a number of places to see how it will appear on screen before and after your schedule it.
From the Shows page:
Simply click the thumbnail of the show and you can click Play to preview your show here.
From the Show editor:
When you edit a show, you can click the preview thumbnail at the top and even view it full screen right in the editor.
When you schedule a show:
On the Edit Schedule window, after you’ve clicked to schedule your show, you can click Show List to view a preview of the show there as well.
From the Hubs page:
If you click on the thumbnail next to the Hub, you can preview the active show in the Hub window.