Vertical menu level 2 is wrong.
It seems to be a bug in the CSS Menu Writer. I have created a menu that will act as drop-down menu for mobiles. I've started from category: "Simple", type: "Vertical". Then I have created a new level 1, with only the word Menu. Then I moved all the headlines in level 1 to level 2.
By default, the width of each level is set to 150px. If you wish to change the width to 100px for example - will not level 2 display correctly. There is no way to change where level 2 is shown sideways in Menu writer. When I look in the CSS file, the rule: "ul # cssmw0 ul.level-2", it says: "left: 165px". This one must be able to influence even inside the Menu Writer.