In case there are people seeking help with this for 7.1 (as I recently did but came up empty-handed), here is a JS code that can be inserted within the <head> tag (Settings > Developer Tools > Code Injection).
<script>
window.addEventListener('load', function() {
var container = document.querySelector('.list-grid');
var items = Array.from(container.getElementsByClassName('grid-item'));
items.sort(function(a, b) {
var titleA = a.querySelector('.grid-title').textContent.trim().toLowerCase();
var titleB = b.querySelector('.grid-title').textContent.trim().toLowerCase();
if (titleA < titleB) {
return -1;
}
if (titleA > titleB) {
return 1;
}
return 0;
});
container.innerHTML = '';
items.forEach(function(item) {
container.appendChild(item);
});
});
</script>
