Nintendo Switch Manual page 92

Even if you restore factory settings without
deleting save data, you will become unable to
use software data saved on a microSD card.
As your user information and Nintendo Account
link will not be deleted if you reformat your
console in this way, you can redownload deleted
software data from Nintendo eShop.
◆ Screenshots saved to a microSD card will not
be affected and can continue to be used.
◆ Redownloading may not be possible for
software that is no longer being distributed.
How to restore factory settings without deleting
save data
Unlike other formatting options, this must be done
by accessing a special recovery mode.
1. Turn the console off.
2. Press the POWER Button while holding the
volume up and volume down buttons. Continue
holding the volume buttons to open recovery
mode.
Keep holding the volume buttons
until recover y
P u s h
3. Select "Restore Factory Settings Without
m o d e is displayed