Required User Privileges: Company Admin / Screen Admin
The first step is to click on Manage at the bottom left corner of SalesScreen.
A menu will pop up, where you can proceed to click on Screens under the Company headline:
Once on the Screens management page, make sure the Slides tab on the top is selected:
Locate the slide by scrolling to it or using the filter, order or search options. Once you can spot the right slide, click the eye icon to preview it.
A popup window will appear letting you previewing the slide that you have chosen:
Simply click outside the preview screen, and it will close.