In Xcode after doing a ScreenShot in Organizer and pressing “Save as Launch Image” the image does not appear in the Groups and Files / project files. The file do however exist in the project folder if you navigate to it in Finder.
To remove it go to your specific Target and select “Build Phases” -> extend “Copy Bundle Resources”. Here you should be able to find the ‘missing’ file you can’t see in the project files. For the splashscreen it’s default name is Default.png when saving from the Organizer.