Update on Samsung Galaxy Note 10.1 2014 changed format. Now have "My File" icon on home page lower left. Cannot not find menu

No, Android updates tend to change the interface a bit. You can move all the icons around if you want though to where they used to be.
 


I have the same Tablet model and am also frustrated with the update. I saw the notification the other day and clicked "Install" because my impression was that it was just about better security. Then I found the appearance and some functions had changed, and I HATE the upgrade. Is it possible to "go back in time" so to speak, by restoring everything to factory settings?