By default, moving the analog sticks upward in Lego Fortnite will also move the in-game camera upwards while moving it down will tilt the camera downwards. You can check out this Seeking Tech guide to see how you can invert these controls.
1. Start off by heading to the Settings menu in Lego Fortnite.
2. From there, use the L1/R1 buttons on a PlayStation controller, LB/RB buttons on an Xbox controller or L and R buttons on a Nintendo Switch controller to change tabs until you are viewing the Game tab.
3. From there, move the cursor down to Inverted View. It should be showing the following description:
Turns off inversion on/off. When on your character will look down when the controller is moved up.
4. Make sure that the Inverted View setting is set to On.
5. Apply the new change. This can be done by pressing Triangle on the PlayStation pad, Y on the Xbox pad or X on the Switch pad.
The camera will now be pointed down when you tilt the right analog upwards. If you tilt the analog downwards, then the camera will move up.