We've retired the fields for adding topic and sub-topic numbers to lessons. For any of our users who use this feature, you simply just need to prefix a number to your topic or screen titles. 

In fact, that's exactly what we've done for topic or screen titles that previously used these fields! Yep, we've automatically prefixed these numbers to the titles for you, so there won't be anything for you to do, and nothing changes for your learners — easy!