whmcsDNSManager/modules/addons/DNSManager2/templates/admin/pages/settings/modal/additional-configuration.tpl

<div class="form-group" {if !$soaSupport}style="display: none"{/if}>
    <label for="fs4" class="col-sm-3 control-label">{$MGLANG->T('overwrite_soa')}</label>
    <div class="col-sm-9 checkbox">
        <input type="checkbox" id="fs4" name="setting[overwrite_soa]" {if $server.setting.overwrite_soa eq 'on'}checked=""{/if}/>
    </div>
</div> 
<div class="form-group" {if $disabledNs}style="display:none"{/if}>
    <label for="fs5" class="col-sm-3 control-label">{$MGLANG->T('ns_populate')}</label>
    <div class="col-sm-9 checkbox">
        <input type="checkbox" id="fs5" name="setting[populate_ns]" {if $server.setting.populate_ns eq 'on'}checked=""{/if}/>
    </div>
</div>