Let me just try adding my last 2 cents on the matter.
So the big numbers are for your selected period. For the whole period 19th October - 21st November.
0 returning users means none of the previous users that had sessions before 19th October, had any sessions in period from 19th of October to 21st of November. All users for this period were new.
And in the table, you can treat that data as your selected period divided in sub periods and each row represents data for this sub period specified in the first column.
So the big numbers are not just sum of numbers in the table. Sum of the data in the table would be sessions, but we are talking about users
But rather those big numbers show you in total overview of the period, where you can easily conclude that there were only 24 users for selected period, some of them had multiple sessions during that period and all of them are new users.
Hope that helps