Hii, i have the Sony vegas pro 14 and i'm having problems with the docking area

if you press F11 the docking area will go away so that you have more space if you are only using the audio tracks

but I guess i pressed something wrong because i need the docking area for editing my youtube videos and if you press F11 again then it has to come back but it's not coming back. I don't know what to do now.