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Single Slideshow Window is a simple and straightforward add-in made for Microsoft PowerPoint, which prevents the application from playing multiple presentations in different windows (multiple instances).

By default, Microsoft's program opens a new window for each linked slideshow if you leave the original window opened. In this case, it's necessary to go through the tedious task of closing each window manually to close everything. This is why this add-n was made, to spare you the trouble and restricting only one window for the slideshows. When a new presentation is up for playback, the previous one will be automatically closed.

The downloaded archive contains a .ppa file that can be double-clicked to open PowerPoint right away and enable macro support if you're prompted by a security notice window (because Microsoft recognizes this add-in as coming from an untrusted source).

If this didn't work or if Microsoft PowerPoint is not associated with this file type on your computer, then you can find the Add-ins section in the Tools menu to manually install Single Slideshow Window by locating and opening the SngSSWnd file.

It's not necessary to click any buttons to enable Single Slideshow Window, since changes are immediately applied when it's loaded in PowerPoint, so the tool is automatically blocked from playing slideshows in separate windows.

At least Microsoft PowerPoint 97 must be installed on the computer to be able to load this add-in. It also works on Office 2016.