questions regarding customization help needed urgent :

Hi there,

Issue #1:
Select the Grid block and set the Grid Template Columns value to 1fr: https://cln.sh/TDY0VvlWRj0QJJ9Vb5H5

Issue #2:
Add the following snippet:

add_filter( 'generate_sticky_navigation_logo_output', function( $output ) {
    $site_url  = 'https://example.com/';
    $site_name = 'Example Site';
    $title = '<div class="site-branding" style="margin-left: 20px;">
        <p class="main-title" itemprop="headline">
            <a href="' . esc_url( $site_url ) . '" rel="home">' . esc_html( $site_name ) . '</a>
        </p>
    </div>';
    return $output . $title;
} );

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

Make sure to replace the $site_url and $site_name values with your own site details. After that purge the cache.

Issue #3:
Depending on the type of image you’re using, you can use either an Image block or a Shape block:
https://learn.generatepress.com/blocks/block/image/
https://learn.generatepress.com/blocks/block/shape/