However, you need to keep in mind that not every resolution is stretched and there are only a few that work as a stretched resolution. Once there you can change the resolution by inputting the correct values.
In the document scroll down until you see 2 lines saying “DesiredScreenWidth” and “DesiredScreenHeight”. Open the document and that should take you to the game settings. After that go into the folder ‘Config’ then ‘WindowsClient’ and finally you will see a text document named ‘GameUserSettings’. Open the folder named ‘FortniteGame’ and then open the folder ‘Saved’. Over there type %localappdata% and hit enter and you Appdata Step 2 Open file explorer/my computer and then click on the search bar.