You can simply remove the "required" attribute if you don't need it
$('select').removeAttr('required');
If you want to reset, please follow these steps:
$('select').prop('required', 'required');
If you want to remove a specific select2 dropdown based on id or class, please follow these steps:
$('#your_id_name').removeAttr('required');
Use class name:
$('.your_class_name').removeAttr('required');
Similarly, you can set based on id and class, like this:
$('#your_id_name').prop('required', 'required');
Use class name:
$('.your_class_name').prop('required', 'required');
I hope I understood your question and gave the correct answer.