After you tag a new feature or page, or edit the rules for a feature or page, that page will be listed as "Processing".
This means Pendo is going back in time through historical events to classify them based on the newly-defined rule. Depending on the amount of data you have in Pendo, this can range anywhere from 2 minutes to 2 hours to compute. If this exceeds 24 hours please reach out to our Technical Success team.