"Search" feature can be disabled from Client Support Center by removing the Search box from the template code.
"Search box" can be removed by modifying the 'header' template from Admin CP > Templates > Templates > General.
Following code needs to be removed from the 'header' template :
<form method="post" id="searchform" action="<{$_baseName}><{$_templateGroupPrefix}>/Base/Search/Index" name="SearchForm">
<div class="helptitle"><{if $_baseIndex == true}><{$_language[pleasetypeyourquestion]}><{else}><{$_language[pleasetypeyourquery]}><{/if}></div>
<div class="searchboxcontainer">
<div class="searchbox">
<span class="searchbuttoncontainer">
<a class="searchbutton" href="javascript: void(0);" onclick="$('#searchform').submit();"><span></span><{$_language[searchbutton]}></a>
</span>
<span class="searchinputcontainer"><input type="text" name="searchquery" class="searchquery" onclick="javascript: if ($(this).val() == '<{$_language[pleasetypeyourquestion]}>' || $(this).val() == '<{$_language[pleasetypeyourquery]}>') { $(this).val('').addClass('searchqueryactive'); }" value="<{if $_baseIndex == true}><{$_language[pleasetypeyourquestion]}><{else}><{$_language[pleasetypeyourquery]}><{/if}>" /></span>
</div>
</div>
</form>
Gurpreet Singh