If your rendering mode is not being saved when you start Fortnite, please, try the following:
- Open the Epic Games Launcher.
- Click on your Display Name (your initials in a circle) In the top-right corner.
- Select Settings.
- Scroll down and expand Fortnite.
- Check the box for Additional Command Line Arguments.
- Clear all of the commands that were included in the command line.
- Enter the command line that matches the rending mode you would like to use (see below).
Rendering Modes:
To launch Fortnite with DirectX 11 use this command in step 7: -d3d11
To launch Fortnite with DirectX 12 use this command in step 7: -d3d12
To launch Fortnite with Performance Mode use this command in step 7: -FeatureLevelEs31