How to change the interface or positions of the home and back buttons after updating a Galaxy Tab 2 7.0 tablet? My Samsung Galaxy Tab 2 7.0 downloaded an update. 

Now, the buttons (home, back) on the bar are in the middle. Previously, they were postioned left. It's really uncomfortable. It seems that I received the "mobile user interface" instead of the tablet interface.

How to do I change this?
Google migrated to using the mobile interface for tablets in android 4.2

You will not be able to change to the previous button arrangement on your stock ROM.

You could root your phone and install a custom ROM such as paranoid android to get back your old button arrangement.

Hope this helps.