Something happened to one of my menus

Well, I tried that one already, but my columns look like this

xxx
xxx
xx
xx
xx
xx
xx
xx
xx
xx
xx
xx

That is, the three columns are not of equal heights, because the menu goes all the way to the top of the screen. It did not do that before, and I have another menu that have two columns and they are of equal height.

So, there must be something else I need to set to get it back to what I had.

Regards,

Hans L