Scrollable Web Container

I thought there used to be scrollable web containers? I can even see where you can set the scroll to vertical or horizontal. I have a rectangle in my container. The size of the container is 1500 high. When I set the container up on a page at 500 high, I would expect to be able to scroll down. No matter what I do, the container will not let me scroll. Is this a bug? Is there something I can do like this to make it scrollable? Mac M1. Thanks

The scrollbar is not visible (in Chrome at least) until you start scrolling.
2022-10-03_22-11-20.2022-10-03 22_12_59