Help with this code please

I found this, I have columns in a grid, please let me know where I use the .equal columns & .av_one_full in the develop settings, thank you.

//make grid equal height columns with class
function equal_height_columns() {
?>
<script>
(function () {
const wrapper = document.querySelector(“.equal-columns”);
if (!wrapper) return;

const columns = wrapper.querySelectorAll(“.av_one_full”);
let maxHeight = 0;

function adjustHeight(el) {
el.style.height = maxHeight + “px”;
}

function findMaxHeight(el) {
maxHeight = Math.max(maxHeight, el.clientHeight);
}

columns.forEach(findMaxHeight);
columns.forEach(adjustHeight);
})();
</script>
<?php
}
add_action(‘wp_footer’, ‘equal_height_columns’);