JAVASCRIPT

select2 disable search

$("#js-example-basic-hide-search").select2({
    minimumResultsForSearch: Infinity
});

select2 search disable

$("#js-example-basic-hide-search").select2({
    minimumResultsForSearch: -1
});

select2 disable search bar

<select class="form-select" data-minimum-results-for-search="Infinity">
    <option></option>
    <option value="1">First</option>
    <option value="2">Second</option>
    <option value="3">Third</option>
</select>