Keith Gilbert wrote a review of Search in Styles for InDesignSecrets.com that serves as a great user guide.
Click here to read (you will be taken to a different website).
If you have any questions or comments about Search in Styles, please write them below.
Deborah Johnson
September 10, 2018 11:06 amActually I figured it out! Delete the 90% Black tint swatch and replace with 100% Black and then the script finds all of the styles originally in 90% and changes the colour setting to overprint. Done!