[Theme Horse Support Team]

Hi there,

Go to Appearance > Customize > Additional CSS and paste the below custom css code to resize the logo you can change the digit value below as per your need.

@media (max-width: 767px) {
    .site-branding .custom-logo-link {
        width: 100px;
    }
}

Regarding to dropdown menu for mobile devices this will be fixed in next version update which will be available within a couple of days.

Thank you!