Thanks @slash1andy.
I couldn’t wait to resolve this as my site was live, so I went ahead and deleted WooCommerce from my site (https://docs.woocommerce.com/document/installing-uninstalling-woocommerce/) and re-installed it. Once Woo was deleted, I was able to use my theme’s Appearance->Customize menu to set my home page back to the way it was before. Fortunately, my Woo was only a day old, so deleting, reinstalling, and setting it up took only an hour or so.
I had worked for days to customize by site just the way I wanted it, including a bunch of CSS code. It appeared that Woo overwrote all that, and took over my site!
What frustrated me most was that this happened without warning when I clicked on a benign-looking button in Woo’s settings. I think it’s unacceptable for any plugin to do this. What would be a good place to provide this feedback on Woo?
