The phrase "button setup" refers to arranging or organizing buttons, particularly on a device, in a specific way for easy use and accessibility. Full definition
Users may also have the option to have the traditional 3 - button setup on the screen. (ibtimes.com)
Both devices also have the same three - button setup for navigating the watch. (windowscentral.com)
I was amazed how great the game controlled using the classic button setup including the left analog stick and the four face buttons. (cogconnected.com)