Default [Q] Home Bar / Navigation bar help constantly on

The one to save any confusion it is the one with open tabs, home button, back button and open task manager.

it is on constantly, even when apps are open.

it used to go off when i opened apps but no longer does and just pushes the app up so i loose the top section off the app.

i've looked and googled but can't find anything.

The tab is rooted but i've not installed anything to change it.

Can some kind sole tell me where the setting is to put it back to default.

Thank you

Galaxy Tab Model : 2 7.0
Galaxy Tab Number : GT-P3110
Android Version : 4.1.1 Jellybean