Nintendo Switch Manual page 8

How to remove the game card
To remove the game card from the console, open
the game card slot cover and push the game
card in until it pops up, then remove it.
l C c i ! k
When you're finishing using the console
You can put your Nintendo Switch console into
sleep mode when you're done using it. That way, if
you want to use it again, you can wake it from
sleep mode and start playing right away.
The battery will last XX days if the console is put
into sleep mode from full charge.
Putting the console into sleep mode
Hold  (HOME Button) for one second or more to
open Quick Settings, then select Sleep Mode.
Waking the console from sleep mode