[Q] No Navigation Bar? topic

Hi guys a noob here!
So here's my problem: I rooted my phone and all that (still stock android) however during my time using my phone rooted i decided i wanted to use my phone in full-screen, as i already installed gravity box with xposed installer, i used gravity box's 'expanded desktop' mode and i have turned off expanded desktop however the navigation bar is gone. Any ideas whats happened? What do i do to get it back?