I have been trying to get the Main Menu to work correctly, but I'm having a lot of problems. For instance, I created a header called Policies and Procedures, then moved four articles under this parent. Rebuild the menu. Checked "Display Menu Item Title" and "Display in Menu" were on. I did discover if I shortened the first item's title, then all of the items under the heading disappeared.

I tried to set it up as a mega menu, but that didn't work with this style used for the menu on the lefthand side of the page.

I need to know what I'm doing wrong, so I don't continue to be frustrated while I'm working on it.

Sometimes the submenu items line up correctly, but mostly they kept moving down the page.

Here is what I see now: