When I put many elements in my menu (top of page), my page breaks the desing.
I can solve this? With other layout and theme?
the way to solve this is the write your own navigation portlet , and use that instead of the default one . You need some sort of paging....
There are several threads in this forum about this, so you might be lucky and someone has already written the code you need (Ihaven't seen any commits though). Otherwise feel free to commit your changes so others can benefit ;)