Hey @J_Wall! In the lefthand sidebar, there should be a History tab like this:
You can look through the changes there and that should let you revert changes to before the import.
I also wanted to call out that we do have a feature that allows you to import other apps as pages within your existing multipage app! You can see the docs here for how to access this: Build multipage apps | Retool Docs.
Let me know if you have any other questions about this!