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