Solution for this topic

You can achieve it by adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

.page-id-875 .sh-titlebar {
    max-height: 400px;
}

Solution for this topic

To make it work on mobile, please remove the above shared CSS code and instead use the below shared code.

.page-id-875 #page-container .sh-titlebar {
    height: auto !important;
}