Theme Horse

Ok please go to ‘Appearance > Customize > Additional CSS’ and paste the below custom CSS code.

@media (max-width: 767px) {
	.navbar-head .col-lg-4 {
		-ms-flex: 0 0 40%;
		flex: 0 0 40%;
		max-width: 40%;
	}
	.navbar-head .col-lg-8 {
		-ms-flex: 0 0 60%;
		flex: 0 0 60%;
		max-width: 60%;
	}
}

we have made the the portion of 40% and 60%. You can decrease the portion of logo and banner ad section as you desired. Like 30% and 70% or 29% and 71% and so on. But make sure the total of the portion should be 100%. If the total of the portions get more than 100% then the banner ad will moves down.

Thanks