How to off demo video on android tab

[Android Central Question]

My tab is Lenovo tab3 7 plus and the demo of this tab constantly keeps on popping

 

[B. Diddy]

Welcome to Android Central! Go to the system settings and see if there's an option for Demo Mode or Retail Mode. If not, then you probably have a floor model that has a special demo mode ROM installed, in which case you'd probably have to flash the regular firmware. Where did you get the tablet from?