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This is an easy way to build a black screen directly into your presentation. This way, you don't have to worry about pressing the B button you can plan for a dark screen when you want the audience to focus on your words, and then click onward to the next slide when you're ready to proceed. You can do this by adding a blank slide with a plain black background, or you can make the words fade out to black before you move on to the next slide. This will delete any default Textboxes from your slide. In case there is still some default design showing up on your slide click on Design > Background > Hide Background Graphics. Click on Design > Background Styles. Then, select the Black Screen option. Alternately: Click Format Background > Fill > Solid Fill > Color. Select the color black from the list of Theme Colors. Then, click Apply to blacken the background of this particular slide. If you'd like to give every slide a black background, then click Apply to All. Go to File, then Save As. Choose an easy-to-find location to save this Powerpoint file, and give it a name that you won't forget. It's important to save your presentation after making major changes: in case your computer dies, there is a power outage, or you simply forget to save your work. Before you try to present this PowerPoint to a group of people, make sure that the screen goes black when you want it to go black. Click on the Slideshow icon on the bottom right-hand corner or the Slideshow From the Beginning option on the panel at the top of the screen. Your computer screen should now look completely black except for a small set of pointer arrows in the bottom left corner. Unfortunately nothing can be done about that but from a distance they are not too visible.
Try simply adding a black slide. Find the Layout button and click on Blank. Make the background black. Save the File. Review the presentation.