Hello,
1) I found that you don’t have any multilanguage plugin, so there is no language switcher to show in header, I removed the demo menu (that we used just like an example that you can add to that area).
To show the currency switcher I enabled the HTML Block 3 in the mobile menu and used switcher shortcode there https://gyazo.com/9958736f9d7d10c35d6c36b2846615a8
2) You added h3 tag for the currency shortcode and it caused an additional margin. I removed that tag and the currency selector is aligned.
Regards