Update folders/file names after changing default save template.

My save template was set to default of {author_sort}/{title}/{title} - {author}
before importing many books.

I wanted to change it to remove the author. How do I update it now? I see no way to do it as a batch or even individually.

Now, it think I would prefer to change it to {tags}/{title}/{title}
But same problem.

Any advice or links to other relevant posts which I could not find would be helpful. Thanks