Change viewport size on mobile

Hi Guys,

Is it possible to change the viewport size on a mobile device.

For example, I have a tablet in landscape orientation, I’m trying to achieve something that looks like the image below… I want the 3D window to take up a certain portion of the screen and the umg widget to take up the remaining space… I don’t want the widget to be overlaid on top of the 3D window. Any ideas how I can achieve this effect