What do I do if Fortnite doesn't save my settings?
If Fortnite isn't saving your settings, try these troubleshooting steps:
Click on Start.
Type %localappdata%, and then press Enter.
Navigate to FortniteGame\Saved\Config\WindowsClient.
Right-click GameUserSettings.ini, and then click Properties.
Uncheck the Read-Only checkbox.
Click Apply.
Launch Fortnite.