Anpassung Schriftgröße Portfolio Titel

Hey Petra,
For the font size in that element try this CSS in your Enfold Theme Options ▸ General Styling ▸ Quick CSS field:

#av-sc-portfolio-1 h3.grid-entry-title.entry-title a {
	font-size: 14px;
}

For adjusting the position of the ajax portfolio element try adding this code to the end of your child theme functions.php file in Appearance ▸ Editor:

function custom_portfolio_preview_container_script() { ?>
  <script>
jQuery(document).ready(function($) {
    // Listen for clicks on elements with the specified class
    $('.page-id-3419 .grid-sort-container .grid-entry').click(function() {
        // Use setInterval to check every 100 milliseconds if the element has become visible
        var checkVisibility = setInterval(function() {
            // Check if the element is visible
            if ($('.page-id-3419 .portfolio_preview_container.open_container').is(':visible')) {
                // Clear the interval once the element is visible
                clearInterval(checkVisibility);

                // Calculate the top position of the element and adjust it
                var elementTop = $('.page-id-3419 #av_section_2').offset().top;
                var newScrollTop = elementTop - 30; // Adjusting to scroll 20px above the element

                // Scroll the page to the new position
                $('html, body').animate({
                    scrollTop: newScrollTop
                }, 1200); // 1200ms for a smooth animation
            }
        }, 100); // Check every 100 milliseconds
    });
});
</script>
  <?php
}
add_action( 'wp_footer', 'custom_portfolio_preview_container_script', 99 );

note that the script specifically checks the page ID because the scroll position is calculated by the bottom of the element above the portfolio grid, so keep this in mind if you want to duplicate this for another page.

Best regards,
Mike