Long sub-menu, last items don’t show

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I just noticed this: One of our submenu lists is very long, and on a desktop (haven’t checked mobile yet), the last items don’t show, you can’t scroll down to them.

How can I fix this, and better yet, make the submenu reveal itself as more columns, so that it spreads across the window, so you don’t have to scroll down, you can just go across to the last items on the menu list?

If you go to Cartoons/Panel Cartoons on the website, you’ll see it scrolls down a bit, but only goes down to “Mr Brunelle”, but there are a few more underneath that.

Thanks!