You can save a combination of color properties and font characteristics as a style, for later use. You can save any number of styles. Thumbnails of all saved styles appear in the Title Styles panel, so you can quickly apply your custom styles across projects. Premiere Pro also includes a set of default styles.
By default, Premiere Pro stores all saved styles as style library files that use the .prsl filename extension. When you save a style library, you are saving the entire set of styles that are displayed in the Titler.
The preset style library is stored in the following location: