Change select2 box to ordinary select

I have only a short list of clients hence no need for search in select box. I use a tablet for creating invoices and virtual keyboard bothers a lot. How may I customise it? Which file will I edit?

The corresponding input field:
And the PHP function to get the clients:

Thank you. I figured it out.

Maybe you could share your code here for other interested people?

            <div class="form-group">
                <label for="client_name"><?php echo lang('client'); ?></label>
                <div class="controls">
                    <select name="client_name" id="client_name"
                        <option value=""></option>
                        <?php foreach ($clients as $client) { ?>
                            <option value="<?php echo $client->client_name; ?>"
                   <?php if ($this->mdl_clients->form_value('client_name') == $client->client_name) { ?>selected="selected"<?php } ?>>
                            <?php echo $client->client_name; ?>
                        <?php } ?>
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