thanks xMCNUGGETx for the info, very useful one!
However, that's not what I need, I should've explained it better.
I actually needed to use a split view, see the 3 screenshots below (they are taken on my desktop pc, where FD's layout works well, as you can see)
I actually managed to export the working layout to a .fld file, and imported it in FD on my notebook, and now it's working well.
I wish I knew an easier way of activating that option (what would've happened if I hadn't the other PC where FD was well configured?)