Nintendo Switch FW 10.0.0 is out. Includes 6 new avatars from Animal Crossing: New Horizons https://bit.ly/3elXVcW 

Also allows transfer of "downlopadable software, update data, and DLC from the system memory to an SD card"
- Added an option to remap the controller buttons.

Controller button remap options from Nintendo Switch FW 10.0.0

New Animal Crossing: New Horizons avatars from Nintendo Switch FW 10.0.0

Some more options for controller button remapping on Switch FW 10.0.0 including button remap options for Joy-con and Switch Pro Controller.

Note that you cannot remap special controllers like the SNES controller.

You can now map the confirmation button the wrong way on a Nintendo system

my wish for a one-handed Joy-con RPG configuration comes real, sorta. Assuming the game doesn't need every button https://twitter.com/Wario64/status/838241548257001472