Note that Sharing slides as a Virtual Background is only available on Windows or Mac machines (see the Presenter requirements sub-section). If you get no results, or the results are a web page (accessed via browser) then that confirms the issue. You can search for the PowerPoint program by simply typing PowerPoint in the search box (both Windows and macOS have a search box, usually in the taskbar/dockbar).
Nowadays there are many people that have MS Office online only and don't install the actual apps locally on the machine.
How do you use Office apps, such as Word or PoerPoint itself? Does it open in a browser? But based on what you sayed I wonder if you have MS Office locally installed on the machine. Hi some reason I'm not able to see your screenshots (that you attached to your question) the Community site is acting up and doesn't show when clicking on them.
