@tiberiusjim: Hello there,
Go to => Appearance => Customize => Additional CSS and add the following CSS Code.
/* To reduce the height of header image */
.has-header-image .custom-header-media .wp-custom-header img {
display: none !important;
}
.has-header-image.home .custom-header, .has-header-image.home .custom-header-media {
height: 50vh !important;
}
/* To change the menu item color of cureent page item */
.main-navigation .current-menu-item > a {
color: #ffff5f;
}
You can change the height and color according to your choice.
Let me know if this works out!
Kind Regards,
Skandha