When to compare data
Google’s status dashboard still showed the rollout in progress on 15 November. Record the end date before judging a change in visibility. Google recommends waiting at least a full week after completion, then comparing that week with a week before the rollout began.
What to check in Search Console
Use the same property, filters and search type. Review the pages and queries whose results changed. Record any changes to your own site during the period so you can assess other possible causes.