1. Launch PowerPoint, and open any presentation that you want. A blank one also works.
2. Go to "File". If you do not see this tab, your ribbon may be hidden. In that case, click the small button near the minimize button. Then select either "Show Tabs or Show Tabs and Commands".
3. In the Backstage view, select Options.In the new PowerPoint Options window, go to the Save section. Check the option which says "Don’t show the Backstage when opening or saving files". Then close this window.