Hide soft menus?

[JDW]

I've been using a 28S for almost 26 years and have grown accustomed to being able to hide the soft menus at the touch of a button. I recently purchased a 48GX and a 50g, both of which appear to lack that great feature. I can understand why the 28S has it -- the screen isn't so tall. But the fact is that even with the bigger screen of the 48GX and the massive screen of the 50g, you could still gain one more stack level if you could hide the soft menus. So is there really no way to hide the soft menus on the 48GX and 50g?

Thanks.