Disable tooltip on gallery

Are you talking about the tooltips displayed by the browser itself when hovering over the image?
They appear automatically if the image has a title attribute.

However, if you have a gallery that displays images in a lightbox, this title attribute is also displayed as text in the bottom bar of the lightbox. Completely removing the title tag would therefore be suboptimal. For galleries, you can switch to displaying the description or caption instead, but this is not possible for all Enfold elements.
So if it only affects the galleries on your site, you could do that, but you would then have to update the description of the images, for example.

There is a snippet that, when placed in the child theme’s functions.php, temporarily removes this title tag on hover but adds it back when clicked:

function temporary_removal_title_tags(){
?>
<script>
  window.onload = function() {
    var elementsWithTitle = document.querySelectorAll('a, img, *[title]');
    for (var i = 0; i < elementsWithTitle.length; i++) {
        var element = elementsWithTitle[i];

        element.setAttribute("data-original-title", element.title);

        element.addEventListener("mouseenter", function() {
            this.title = ""; 
        });

        element.addEventListener("mouseleave", function() {
            this.title = this.getAttribute("data-original-title"); 
        });

        element.addEventListener("mousedown", function() {
            this.title = this.getAttribute("data-original-title");
        });
    }
  };
</script>
<?php
}
add_action('wp_footer', 'temporary_removal_title_tags');

here you see that this script is working for all anchor elements or images – or all elements that have a title-tag