Drop down menu stuck down

Made a vertical menu but it stays dropped down at all times.

I made one previously and it drops down on roll-over. Cannot for the life of me figure out why this one won’t. If I switch it to horizontal it just becomes horizontal with all items visible, then weirdly, if I switch it back to vertical, it hides half the menu items.

I tried just copying the existing one, thought I would just edit it, but it won’t let me make changes in the copy.

So - how do I tell a menu to drop down on roll over?

Thanks

It it possible it is opening up behind an element, hiding most of it?

No, definitely not behind anything. The menu is permanently dropped down, over the other page elements. I just need it to do that on roll-over only.

The other existing drop-down menu is right next to it and works fine. I can’t see any difference in the settings but I must be missing something.

Could you please provide a screenshot… Thanks.