I'm designing a kiosk app, we have 2 navigation elements; 1 button for the main menu and 1 for 'back'.
So my question is: When should we show the back button?
For example, after selecting a menu option form the main menu, should the 1st screen have a back button? as we already have a persistent Main menu button that will take them back.
I feel like we should have the back button be ALMOST persistent and suppress only on confirmation pages and the like, where the user cant go back. Displaying it as much as possible will let the user use it like a back button in their browser (Even if it takes them to the same place as the menu button)