I figured out how to direct the Page button to the Home Screen (with the grid image). Just needed to play around more in the Customize > Static Front Page section to understand how it works.
But I’m still not sure how to make the Page button appear activated on the Home Screen when first entering the site, and also have the parent URL (example: xyz.com). Currently the Page button navigates to the Home Screen but the URL has an extra permalink ending (example: xyz.com/abcdefg). Not sure if I’m using the correct terminology, but hopefully that makes sense.