To set the header to the Left Aligned layout navigate to Appearance > Customize > Header and select “Left aligned” from the Layout dropdown.
When the header is using the Left Aligned layout the logo / site title and navigation are left-aligned.
Left Aligned mode has a Top Right and a Bottom Right location that can be set to display either informational text, social media links, WooCommerce shopping cart and account login links or a custom menu. Alternatively these locations can just be set to display nothing.