You can try this tweak:
1- Go to file: root/templates/ja_purity_III (your default template)/tpls/blocks/off-canvas.php
2- Under this line of code:
defined('_JEXEC') or die;
Add this snippet of code:
$user = JFactory::getUser();
$viewLevels = $user->getAuthorisedViewLevels();
$canvasAccess = 7;
if (!in_array($canvasAccess, $viewLevels)) {
return;
}
It will look like this: http://prntscr.com/iqes1l
Note that: $canvasAccess = 7: 7 is the ID of the Access Levels on your site: http://prntscr.com/iqesgd
Regards