TomTom XL Manual page 8

Night /Day
night
Tap this button to set the night colour scheme, which reduces the brightness
of the screen and shows the map using dark colours.
This is useful when driving at night or in dark environments such as long tunnels.
day
Tap this button to set the day colour scheme, which increases the brightness
of the screen and shows the map using bright colours.
Options
options
Tap this button to adjust the settings for your device.
For more information, see the chapter Options.
Help
help
Tap this button to see contact details for local emergency services and other
specialist services, such as hospitals and veterinary clinics. You can then plan
a route to your chosen service centre.
For more information, see the chapter Help.
8