Hi there,
the navigation logo’s height is defined by the Menu Item height in Customizer > Layout > Primary Navigation, increasing that will increase the logo size. In addition to that there is some padding on the logo img which you can remove with this CSS:
.navigation-branding img, .site-logo.mobile-header-logo img {
padding: 0 !important;
}
To manually adjust the Mobile Header logo height without increasing the menu item height this CSS:
.navigation-branding img, .site-logo.mobile-header-logo img {
padding: 0;
}
.site-logo.mobile-header-logo img {
height: 80px;
}