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:
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Simply click outside the preview screen, and it will close.