SubMenu hiding behind container

Hi thanks for this. I had set header and menu to the front, but had issues with moving the container as the option to arrange was greyed out. Attempted to put in place a new container, and even copied over a section that works from a different page, but with the same outcome. Some pages it works, some it doesn’t.

I did think it was due to the arrangement of the items but only some can be rearranged