Ok, I uploaded the website on remote so you can have a proper look.
At this page you can see the plugin working properly through the build-in button (on the right side of the page).
Instead, here, you have the page where I added the class that triggers the off-canvas to the word "EXPOSE!", but it doesn't work... Probably a conflict with laytheme.
Here you can find the whole documentation of the plugin.
Please, I hope that someone will help me,
thanks in advance,
Melo