Reply To: Header height & Site name centered

Go to Appearance => Customize => Site Identity . Uncheck on :Check to move Site Title and Tagline before logo and save.

Go to Appearance => Customize => Additional css and add the following css.

#site-branding, #site-logo {
 	width: 100%;
 	text-align:center;
 }
 #site-header {
 	width: 100%;
 	text-align: center;
 }

Let me know if this resolves your issue.

Regards,
Tikaram