On Mon, May 25, 2020 at 11:18 PM, Marilyn and Don Bilderback wrote:

Can you tell me what the difference is between pressing the OK and the apply one?

I'm not Gene, but the generic answer to that when working under Windows is that Apply does what it says, applies the changes you've made, but it does not close the dialog in which you made them.  This can be very handy if you are in the midst of a cycle of tweaking various things and need to keep tweaking to reach whatever result it is you're seeking.

OK applies the changes and closes the dialog.  If you want to go back in, you need to repeat whatever steps were taken to open the dialog in the first place.
 
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Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363  

Science has become just another voice in the room; it has lost its platform.  Now, you simply declare your own truth.

      ~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019