As per the theme default layout the height of the image used in the banner is restricted. You can however increase the image height by adding in some custom CSS in your Admin Dashboard > Appearance > Customize > Additional CSS :
You can replace the min height value with your desired image height.
Note : After increasing the height of the banner, the page title may also need to be centered manually to adjust with new height. To center the title, you can adjust the padding values using the CSS as follows :
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