Disable the Gutenberg Welcome Guide from showing

disable-welcome-guide.php

<?php

add_action('admin_footer', function () { ?>
    <script>
        window.addEventListener('load', () => {
            window.setTimeout(() => {
                if (wp.data && wp.data.select('core/edit-post').isFeatureActive('welcomeGuide')) {
                    wp.data.dispatch('core/edit-post').toggleFeature('welcomeGuide');
                }
            })
        });
    </script>
    <?php
});