arnaudasselin
The configuration in template settings will be used globally. If you want to show / hide for specific page, you can tweak the layout used on that page.
All the layouts locate in: root/templates/ja_social_ii/tpls/
While the off-canvas block is loaded in the header of template: root/templates/ja_social_ii/tpls/blocks/header.php
you can customize this header block (or clone it to have a new file) >> remove/hide the snippet of code which calls the off-canvas block:
<?php if ($this->getParam('addon_offcanvas_enable')) : ?>
<?php $this->loadBlock ('off-canvas') ?>
<?php endif ?>
then load this new header block into the layout file as you wish.
Regards