How to remove Joomla edit button from listing detail page

You need to edit Joomla's com_content template file:

• \components\com_content\views\article\tmpl\default.php

And delete this:

<?php if ($canEdit) : ?>
<td align="right" width="100%" class="buttonheading">
	<?php echo JHTML::_('icon.edit', $this->article, $this->params, $this->access); ?>
</td>
<?php endif; ?>