In the previous roots to don’t use header-top-navbar was just to comment in lib/config.php header-top-navabar .
Now in new roots there is just header.php. How can I achieve to use not full width header

i think you’ll need to edit the markup in the header.php to your liking. there is a good example on bootstrap examples: http://getbootstrap.com/examples/navbar/. just check the source code with inspect element. or you could just use the code in roots 6.5.2. from the header.php: https://github.com/roots/roots/blob/6.5.2/templates/header.php