Thank you. I forgot about that or didn't see it when I looked at the sources list. I'm starting to learn how to use OBS for recording so I'm sure I'll have more questions despite having read the manual I downloaded.
Using window capture suggests I could use my slide show (of PDF slides) and display each one as needed since it's in a separate window. I'll give that a try.
And, I apologize to all for double posting; I didn't see that my first attempt to post this thread actually worked.
Stay well,
Rich