익스플로러 10 버전 이상에서는 아래의 코드를 추가하시면

셀렉트 박스(select)의 화살표를 표시하지 않습니다.

.kboard-cross-calendar-list .kboard-header .kboard-search-day-form .kboard-search-year::-ms-expand,
.kboard-cross-calendar-list .kboard-header .kboard-search-day-form .kboard-search-month::-ms-expand { display: none; }

기능을 아예 제거하시려면

FTP로 접속해서 /wp-content/plugins/kboard/skin/사용중인스킨/list.php 파일에

아래의 코드를 찾아서

<div class="kboard-header">
	<div class="kboard-search-day-form">
		<form method="get" action="#kboard-cross-calendar-list">
			<?php echo $url->set('kboard_calendar_year', '')->set('kboard_calendar_month', '')->toInput()?>
			
			<a href="<?php echo $url->set('kboard_calendar_type', '')->set('kboard_calendar_year', $prev_year)->set('kboard_calendar_month', $prev_month)->set('keyword', '')->set('target', '')->set('pageid', '')->toString()?>#kboard-cross-calendar-list" class="kboard-cross-calendar-arrow arrow-left">
				<img src="<?php echo $skin_path?>/images/icon-arrow-left.png" alt="" title="<?php echo __('Previous month', 'kboard-cross-calendar')?>">
			</a>
			<select name="kboard_calendar_year" class="kboard-search-year" title="<?php echo __('Select year', 'kboard-cross-calendar')?>" onchange="this.form.submit()">
				<?php for($select_year=1900; $select_year<=2100; $select_year++):?>
				<option value="<?php echo $select_year?>" <?php if($select_year == $kboard_calendar_year):?> selected<?php endif?>><?php echo $select_year?></option>
				<?php endfor?>
			</select>
			<span class="kboard-cross-calendar-sep"> . </span>
			<select name="kboard_calendar_month" class="kboard-search-month" title="<?php echo __('Select month', 'kboard-cross-calendar')?>" onchange="this.form.submit()">
			<?php for($select_month=1; $select_month<=12; $select_month++):?>
				<option value="<?php echo $select_month ?>" <?php if($select_month == $kboard_calendar_month):?>selected<?php endif?>>
				<?php echo sprintf("%02d", $select_month)?></option>
			<?php endfor?>
			</select>
			<a href="<?php echo $url->set('kboard_calendar_type', '')->set('kboard_calendar_year', $next_year)->set('kboard_calendar_month', $next_month)->set('keyword', '')->set('target', '')->set('pageid', '')->toString()?>#kboard-cross-calendar-list" class="kboard-cross-calendar-arrow arrow-right">
				<img src="<?php echo $skin_path?>/images/icon-arrow-right.png" alt="" title="<?php echo __('Next month', 'kboard-cross-calendar')?>">
			</a>
		</form>
	</div>
</div>

아래의 코드로 교체해보시겠어요?

<div class="kboard-header">
	<div class="kboard-search-day-form">
		<form method="get" action="#kboard-cross-calendar-list">
			<?php echo $url->set('kboard_calendar_year', '')->set('kboard_calendar_month', '')->toInput()?>
			<span class="kboard-search-year"><?php echo $kboard_calendar_year?></span>
			<span class="kboard-cross-calendar-sep"> . </span>
			<span class="kboard-search-month"><?php echo $kboard_calendar_month?></span>
		</form>
	</div>
</div>

고맙습니다.