Hi,
Admin can easily disable gender field.
Disable in job form
Admin > JS Jobs > Jobs > Fields and unpublished gender field.
Disable in resume form
Admin > JS Jobs > Resume > Fields and unpublished gender field.
Disable in job search
Admin > JS Jobs > Configurations > Job Seeker > Job Search Options and set hide to gender field.
Disable in resume search
Admin > JS Jobs > Configurations > Employer > List Resume and set hide to gender field.
Edit
../components/com_jsjobs/views/jobapply/tmpl/job_appliedapplications.php
Find and delete it.
<div class="field">
<span class="jsjobs_appliedresume_tab_search_data_title">
<?php echo JText::_('Gender') . ":"; ?>
</span>
<span class="jsjobs_appliedresume_tab_search_data_value">
<?php echo $this->searchoptions['gender']; ?>
</span>
</div>
Edit
../administrator/components/com_jsjobs/views/jobapply/tmpl/jobappliedresume.php
Find and delete
<span class="jobs_search_fields"><?php echo $this->searchoptions['gender']; ?></span>
and
<div class="js-col-xs-12 js-col-md-6 js-field color-font"><span class="js-bold color-default"><?php echo JText::_('Gender'); ?></span>: <?php if($row->gender == 1) echo JText::_('Male'); else echo JText::_('Female'); ?></div>