The Style Tools adds some operations on the style and rendering of the titles. The Tools applies by default to a new file, so you can check what you have done (if you do not want that, uncheck Create New File).
Copy the style from one document to another.
Use Commit to fix the current wrap (simple wrap or smart wrap) and create real two-liners. This is useful if you want to export the titles. Or Remove the wrap to create one-liners again.