Where in FLAT do I control and [h1] ?

In FLAT, do I have page-level (article) control over <title> and [h1], or are either of these two HTML elements controlled at the menu-level?

<title> is set in the same way as Joomla does it (e.g. Article Title - Site name).

And Flat uses <h2> tag for articles titles. If you like to change it to <h1>, edit corresponding view file in template's html/com_content directory.

Hi. My pages are showing H2 for the page title and H2 for the sub heading. Which file do I change so the Article title changes from H2 to H1?

Flat displays page title in <h1> (template's index.php), and <h2> is used for article title (template's html/com_content/article/default.php).