Glad to hear that.
The header elements background image size is set to Cover. Which means it will always fill the container.
The height of the container is defined by a. the content and b. the top and bottom padding. So you may want to reduce the padding to make it shorter. Note: you can set different padding for mobile by selecting the mobile icon.
Making it fit across all device sizes and orientations is tricky when there is content in the header element – as this introduces additional height. Its also a complete nightmare when you use a Portrait Image as that really only works well with Mobile.