I am using the adb feature to set the screensize to see how the app looks on smaller screens. using the command :
adb shell am display-size 1200x720
in 4.3 the command is
adb shell wm size 1200x720
But it is seems to be behaving stupidly as it displays portrait view of the app in landscape view of the device.
Leaving so much screen not used and result is a smaller looking device than need be. The device is the Nexus 7