Hello,
I see the register text on your site, but I am not sure why it's showing. I just installed a fresh Corpway Site Shaper, patched vertex, turned off responsive, and set the sidebar option. And it shows fine.
I am leaning more towards something is corrupt on his install or he modified something because this div is showing in his source "s5_responsive_mobile_sidebar". That's impossible for that div to show when responsive is called off due to this call:
<!-- Call mobile sidebar -->
<?php if ($s5_responsive_mobile_layout == "sidebar" && $s5_responsive == "enabled") {?>
<div id="s5_responsive_mobile_sidebar" class="s5_responsive_mobile_sidebar_hide_<?php if($s5_language_direction == "1") { echo "rtl"; } else { echo "ltr"; } ?>">
<?php require(dirname(__FILE__)."/../../vertex/responsive/responsive_mobile_sidebar.php"); ?>
</div>
<div id="s5_responsive_mobile_sidebar_body_wrap">
<div id="s5_responsive_mobile_sidebar_body_wrap_inner">
<?php } ?>
You can most likely override this with the CSS below in the custom.css file:
#s5_responsive_mobile_sidebar {
display:none !important;
}