Hello there,
About the off-canvas menu, it wasn't shown it's because you have assigned all the menu under Arabic menu item. But you selected another one as off-canvas menu, which is fixed now. See the screenshot. You can change the color from template options. Icons were missing due to the wrong custom CSS you have used. See the screenshot here. You wrote fa instead of fas which prevented to show the contact icon, after changing it, it appeared again. Same goes for the other icons as well. We highly recommend you to change the css on your own to the right one, or else delete if not needed.
Your Google tag manager code is removed as well, as Helix Ultimate comes up with a better solution. Here we have removed the code, and copy the token number and paste it inside the Google Analytics section, see here.
That's all about your queries and solution.
Check from your end and let us know.
Thanks!