I believe people have done ppt presentations such an experience: sometimes do not want to be directly occupy the entire screen full screen ppt, at least want to be able to see the taskbar, so you can still easily switch programs.
How to achieve it?
Very simple, see the figure it :)
https://www.ellenfinkelstein.com/pptblog/using-window-instead-full-screen-for-slide-show-view/