Depending on how much "stretch" you want, here are the top picks for 16:9 monitors:
Set your GPU scaling to "Full Screen" to ensure the image stretches to fill your monitor. Fortnite Stretched Resolution: Best GameUserSet...
Used by many pro players. It offers a more noticeable stretch and a significant performance jump for mid-range PCs. Depending on how much "stretch" you want, here
You must also create a Custom Resolution in your GPU control panel (NVIDIA Control Panel or AMD Radeon Software) that matches what you put in the config file, or you'll see black bars. Fortnite Stretched Resolution: Best GameUserSet...
Right-click and select Properties . Ensure "Read-only" is unchecked , then open the file with Notepad.
The "sweet spot." It provides a slight boost in FPS and visibility without making the game look too blurry or distorted.