Is there a way to remove a tooltip of a plugin via custom CSS? [closed]

Question

With CSS – unfortunately no 🙁

The best way of course if you remove it just from HTML. Try to search for all files and look if there is a function like apply_filters() – it allows you to remove that attribute via preg_replace() or with even simpler way.

If you can not find the way to remove it in HTML, you can do it with jQuery/JavaScript (obviously need to make sure jquery is enqueued).

jQuery(function($){
    $('.number.qty_input').removeAttr('title');
});