I’ve created a new menu item in the root. But now it is arranged at first position in the menu bar.
How can i change the position of my menu item?

I’ve found out, by setting an “id” it will appended at the end. But is there any way to insert at a special position?

By adding a menu entry with an existing id (and just the id) you can make all following menu items appear after it. I think that’s how it works but I never used it myself.