If you are using DirectX 12 and having issues playing Fortnite you can switch to DirectX 11.
- Open the Epic Games Launcher.
- In the top-right corner, click on the initial of your Display Name
- Select Settings.
- Scroll down and expand Fortnite.
- Check the box for Additional Command Line Arguments.
- Type: -d3d11
- Relaunch Fortnite.
Note: In order to switch back to DirectX 12 you need to delete the command/uncheck the box.
If this did not help solve the issue try the next step in our troubleshooting: How do I update my video card drivers to fix problems with Fortnite?