Drawer menu not responding from the header EXHIBIT theme

[emes]

Hi there, 

I was working for a week on customizing the EXHIBIT theme. There were many changes and Custom CSS added along the way and at some point, hard to say when the drawer menu from the header, on both desktop and mobile stopped responding. 

I know that one of the solutions is to revert back the changes, but a thought of setting up and adding all those small pieces all over again makes me dizzy.

Is there any way to fix this?

I have tried in incognito mode - no results, 

I have uninstalled the apps - no results, 

I even tried to compare the codes with the theme version that works fine - I have spotted nothing.

Any hints/fixes will save a week of my life <crying>