selectize.js: Fetch all selected values from selectized dropdown

I hope everyone of you is in good health.

I have multiple select options have different classes and names and I am using selectize library to allow the user to search. I want to get the selected values on click of a button. Right now, I have tried the following code ……

$(window).bind("load", function()
{
    var selectize_search_1 = $('.selectize_search_1').selectize(
    {
        sortField: 'text'
    });
    var selectize_search_2 = $('.selectize_search_2').selectize(
    {
        sortField: 'text'
    });
});
function fetch_cars()
{
    var cars_value = $('.selectize_search_1')[0].selectize.items;
    alert (cars_value);
}

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.13.3/css/selectize.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.13.3/js/standalone/selectize.min.js"></script>

<select class="selectize_search_1" name="cars[]" required>
    <option value="">Select Car</option>
    <option value="C1">Car 1</option>
    <option value="C2">Car 2</option>
    <option value="C3">Car 3</option>
</select>
<br />
<select class="selectize_search_1" name="cars[]" required>
    <option value="">Select Car</option>
    <option value="C1">Car 1</option>
    <option value="C2">Car 2</option>
    <option value="C3">Car 3</option>
</select>
<hr />
<button type="button" onclick="fetch_cars();">Fetch Cars</button>

So, lets suppose i select car 1 and car 2 from the dropdowns, but using the above code, it only return me the selected value in the first dropdown but not both selected values. Kindly help.