I now see what I have been doing wrong. I had the Save setting to Save Draft, but when I close the editor, I was clicking on the Publish button in an attempt to publish as a draft post. I now realise that I do not need to select Publish from the editor. The post is saved regularly as a draft post and I can preview and amend as I do now.
So I now need to work on updating my skills to learn this new ‘Block’ editor. I don’t think I’m going to drop Open Live Writer as an editor, but I think I need an additional string to my blogging bow. It’s funny, I originally started using the WordPress editor before moving to Microsoft’s Windows Live Editor which was part of the Windows Essentials software. When this deprecated, I tried using the blog template in Microsoft Word before I found the open source software ‘ Open Live Writer ‘. So in a fashion, I have come full circle.
My thank must go to @themagicrobot who’s response in the WordPress Support Forums showed me the error of my ways.