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Buttons and gestures shows what every button, tap zone and swipe does, and lets you change it on the device.
Open it in the settings, under Device. First choose where a change applies: Everywhere, While reading, On the home screen, In the library or in one tool. Then pick an input, such as a held button or a swipe in from an edge, and choose an action from the list, which you can search. As standard gives back what the plugins and the button layout set.
On the X4, a change that would leave no button to select, go back or move on with is refused. Reset buttons and gestures at the end takes back every change.