Sorry, f-16, misunderstood what you wanted. Most people ask how to deal with the top of the instrument panel being too high.
About the windscreen view, I tried it (on the 777) and find that if you 'click and hold' the mouse in the middle of the windscreen, you can move the whole screen down. You can move the overhead panel the same way (click and hold) if you like.
Of course, that will leave you with a black strip at the top of the (computer) screen, but you can fix that too, by putting the mouse at the top edge of the screen - when the mouse pointer becomes a 'double arrow' you can extend the whole top of the screen upwards, and the bottom part stays where it is.
Forgive me, though, I can't for the life of me work out WHY you want to do it! :) It's just going to give you a view of a lot more sky, and useful things that you need to see (like the runway at takeoff, for example

) are going to sink from view!