Good point! For me it still makes sense, since it’s all the same page. Especially if the header isn’t set to fixed.
A way you can achieve this would be by putting the page region inside a wrapper with the style properties overflow: auto; and max-height: 90vh; while using height: 10vh; on the header (you can use any sizes there)
then simply add an inline css with body { overflow: hidden; } and then you only have a scroll bar on the included content.

Thanks, Thimo! I modified your idea and used it on a wrapper instead of a page region. Worked like a charm to give me a horizontal scroll bar on a wrapper component with overflow hidden.

Glad this worked.