No off-canvas sidebar in my template layot

There is no off-canvas Sidebar in my template layot.
How can I fix it?
Thanks

Hi packettours,
I have helped you add the following CSS code to your site, you can check it now.

.off-canvas-left.t3-off-canvas,
.off-canvas-toggle {
    display: block !important;
}

Also, I have custom the /templates/ja_social_ii/tpls/blocks/header.php file.

Thank you very much for your big help. It works very well.