Well, I found the Dashboard>Settings>Reading page where I could set the page as a “static” home page, but this gave me two “Home” entries on the menu!!
By setting the “About” page as the “parent” of the “Home” page, the extra “Home” menu item disappears from the top level of the menu, but is now shown as a “child” of “About” when mousing over the “About” menu item (which still seems a bit bizarre)!!!