I currently don't see a menu in your site because you've set your bar to absolute position.
I've set it to relative and checked the view on mobile and I see this.
The fix would be to set the Self Flex option of the containers containing your logo and menu to Standard. Then, set your Bar's height to auto. Last is set your Image's and Menu Toggle's margins to 0.
Here's the result:
It would be beneficial that you learn in our Knowledge Base first in order for you to know what the options will do. For this particular case, I'd like to point you to Element Resources section of our KB.