I recently upgraded from an Android 4.4/KitKat Samsung S4 to an Android 5.0/Lollipop Asus Zenfone 2. On my Android 4.4 device, there was a menu button on the bottom left. On my new Zenfone there is no menu button on the bottom of the phone or anywhere else on the device. ON the Zenfone, the return button is now on the bottom left and the Previous selections are on the bottom right. There is a menu function on the Operating system of my phone to the upper right with 3 dots, but that is on the OS of the phone.. My question is where do I find the menu function to use within an app. Many apps use a menu to do certain tasks. Please advise - thank you.