Navigation Branding Formatting

Hi there,

you can't do it with CSS, unless the 2 words were identical in length.
So you need to adjust the HTML that is output and to do that you need a PHP Snippet like this:

add_filter( 'generate_site_title_output', function( $output ) {
    $titleHTML = '<div>REALWORLD</div><div>INVESTOR.com</div>';
    return sprintf(
        '<%1$s class="main-title" itemprop="headline">
	<a href="%2$s">%3$s</a>
	</%1$s>',
	( is_front_page() && is_home() ) ? 'h1' : 'p',
	esc_url( apply_filters( 'generate_site_title_href', home_url( '/' ) ) ),
	$titleHTML
    );
});

Adding PHP:
https://docs.generatepress.com/article/adding-php/