How to configure a controller in Fortnite
Open the game menu.
On PC/Mac, press Esc.
On PlayStation, press the Options button
On Xbox, press the Menu button
On Switch, press the + button
On Android, press the Menu button and then the Gear icon
Go to Settings.
Go to the Controller Mapping page. You'll have the following configurations on the right side:
Old School
Quick Builder
Combat Pro
Builder Pro
Custom
Select this configuration if you want to customize the controller settings to your own style. Keep in mind that you will also have the option to select which platform the controller belongs to if you play on PC with a controller.
Click Apply