Hi, i did a system upgrade installation on my samsung galaxy note 8.0 which has appeared automatically, and after that my side bar disappeared, it doesn't come back even when i push and hold the back key as i used to do before. Under the settings, the multitask option looks clicked but it also looks disabled hence i cannot unclick and click it again. How do i get my side bar back? I cannot use the multi window feature when i dont have my side bar and honestly it is not very userfriendly without that side bar since it has all the main apps alltogether.. I would really appreciate anyone's help with this..Thank you in advance..