Platform activity now has a third tab, Traction, after Composer. It shows new sign-ups for each of the last 12 weeks, Monday to Sunday in UTC, with the current week marked "so far". Beside it, a retention curve shows the share of those learners who took a learning action in each week after they signed up, from week 0 to week 10. Hovering a point shows the percentage and the counts behind it.
Traction always covers the last 12 weeks, so the date range and Export to Excel are hidden while it is open. The owner and anyone with an access code can see it, and it shows only counts and percentages.