^{Menu: Settings → Reset C64 Keyboard Keys}

If you chose the menu item Reset C64 Keyboard Keys a new safety window pops open.

Screenshot: safety window (german)

If you click on the button the keyboard keys are resetted to the default values and the window closes again. Clicking on the button closes the window without changing the current settings.

The appendix features the default values for the C64 keyboard layout under default keyboard layout.