Well I did get around to trying these things out. There are so many choices when you type into the library manager "SSD1306". So I just installed everything that had that number. There wasn't anything which said I shouldn't or explained in clear language which choice is for what purpose.
I'm totally new at this stuff and there's not much there to guide when you aren't sure what to do.
I poked around trying to compile and upload then. Most things under the subheading SSD1306** (wildcard) in the examples didn't do anything but a couple of choices did seem to put something on the screens (both large and small).
So it's a start.
I finally found something on the actual manufacturer's website but it doesn't really seem so useful to me:
The library choices within the Windows 10 Arduino app, the library names there, very obscure titles which don't convey a lot of usefulness to anyone who is new to this. It becomes pick and poke, then you get frustrated when nothing works. I was on the verge of chucking it, bash it all with a hammer and be done, but at least one or two library examples did do something.