Hey there MisterBananaPant. Sorry for the late reply. Each of your projects has its own Default Engine configuration file, which is why you are getting so many search results.
If you go to your Epic Launcher, click on the tab that says Unreal Engine, go to your Project Library and then right-click on your project, there is an option to “Show in folder.” When you click that option from the pull-down menu, it will bring you to your project folder. From there, it will be in a folder called “Config” and the file is “DefaultEngine”. The screenshots below will show you how to find the file.
