When I am trying to create an app on XCode and I am first setting everything up I cannot seem to find the main.storyboard, I only see the launchScreen.storyboard.
XCode Application startup
A main.storyboard isn't included by default with all project template, on all platforms, so depending on which you choose when starting, it may be missing.
If you're working with a tutorial, be sure it's up to date with the latest Xcode, 11.3
In the dialog where you create the project, you have a checkBox with Use storyboard or a userInterface popup. In either case, select Storryboard option.