User error adding files to existing repository using Git desktop

Thanks for looking.

I was working in an existing and active repository. I attempted to create a new repository in another folder using the menu options.
I believe that I clicked onto the right folder to create a new repo but
9875 new files have appeared in my existing repository.

I have the list of those files awaiting me to add them to a commit which I have not done. How do i remove this list of files please?