Custom menu in Sidebar

Hi, I have a page in which I used the left sidebar layout. I created a sidebar, put it in the widgets and selected as the sidebar to use. In the sidebar I put a custom menu, and it appears like in this image (http://imgur.com/a/Udi4O)

Anyway, you can see that between the voice ‘Accounting’ and the voice ‘Invoices’ there is a gap. That’s because the menu is structured like this:
– Getting started
– Accounting
– Invoice
– Open invoice
– Close invoice
– Payments

Is there a way to show the menu in another way? For example just the first two voices and, when I hover the second one I see also the subItem (like in the header). Or a way to space the voices in a better way…

Thanks

Ticket