one of the way to present - and to look at the presentation, usually the person is in the upper right corner, small or bigger, but I discovered at bottom works even better. Instead of just the speaker, one can see also "gallery view" with some of the public present, reacting
I do prefer, whenever possible this way: I can slide the middle and see more or less of the speaker. it is called "side-by-side"
One thing is sure, use pictures as many times as possible, do not put the text you tell on display.
There are projects that ask us to learn how to use slides, others then let us do when we want, not one as I remember, speaks of us as listeners!