How to add or remove totals in the document overview in the templates?

Click on the gear icon in the upper right corner
Go to 'Settings'
Click on the relevant template group in the left menu ('Account Statement Templates' or 'Reminder templates')
Click on the pencil    on the right of the template you want to adjust.
Click on ‘General options’
Use the checkbox to toggle ‘Show totals in document table’ on or off