Maybe you fancy yourself a bit of a pro, perhaps you want specific setups for Joy-Cons and others for your Pro Controller, or you want different profile settings for different games. All of this is possible, so let's show you how.
Nintendo Switch button remap: Head into settings
First thing's first: head into the settings. That's on the Switch's (or Switch Lite's) home screen - you can get there by pressing the Home button - and is the cog-shaped icon beneath your games tiles.
It'll even say 'System Settings' when you tap it the first time - you'll need to tap it again to actually gain access.
From here select Controllers and Sensors on the left side of the screen, which will load a larger menu of options for you to pick from.
Make your remapping changes
If the Joy-Cons are connected to your Switch then these will show up as 'Attached', with left (L) and right (R) marked out - even colour coded for your convenience.
You can select either - or a Pro Controller instead, if that's what you have connected - and then select 'Change' from the list of options. This will open up the remapping screen.
You can change any button's control
It's a very open system, as you can see from our Switch photograph above. Simply select the button control you wish to reassign, then select the control that will become. You can do this multiple times and then save.
Interestingly there's also options for 'Save as a Preset', 'Load a Preset', and 'Reset'. The former two mean you can map buttons for, say, specific games and load that prior to a particular session. Very clever - but you'll likely want to revert back afterwards.
And that's it: Nintendo's controller remapping options are pretty extensive from the in-built software. Just don't go playing any cruel pranks on your friends, y'hear!