The information in this article can help you when the message “The Connected Controller's Button Mapping Changed.” is displayed on Nintendo Switch.
This is not an error message. This is displayed upon waking up the system from sleep mode to indicate that one or more of the paired controllers’ button inputs have been remapped or reconfigured.
Throughout different menus, a wrench icon will be displayed beside the controller in-use at the bottom-left corner of the system screen to indicate that there is a custom button configuration for one or more controllers. This means that one or more button inputs have been remapped or disabled.
Button Mapping: Joy-Con controllers attached to the system showing a wrench icon
Button Mapping: Joy-Con controllers detached from the system showing a wrench icon
What to do
Select either Reset the Button Mapping to return the controller button inputs to factory settings or select Use Without Resetting to enable the custom button configuration.
Important: You can also reset the button mapping from within System Settings.