온라인상담 섹션 파일에서 

     <?php if(count($inquiry1_ctg) > 1) { ?>
                            <li>
                                <span>문의항목</span>
                                <select name="ca_name" id="main_ca_name" required>
                                    <option value="">선택하세요</option>
                                    <?php for ($i=0; $i<count($inquiry1_ctg); $i++) { ?>
                                    <option value="<?php echo $inquiry1_ctg[$i];?>"><?php echo $inquiry1_ctg[$i];?></option>
                                    <?php } ?>
                                </select>
                                <i class="fa fa-angle-down select-arrow"></i>
                            </li>
                        <?php } ?>

위의 내용을 삭제하면 됩니다.