Hi,

This area caused by your custom css. I see you have this code:

\
header .inner-header .container { width: 1903px; }

Please change it to:

\
@media screen and (min-width: 1170px){\
header .inner-header .container { width: 100%; }\
}

And on your mobile - it will display the logo there.

If you still want to remove that area on mobile, please add more this code to Customize > Custom CSS:

\
@media screen and (max-width: 769px){\
#header .inner-header { display: none; }\
}

Best Regards,

PenciDesign