Novo currently does not offer voided checks. However, you can generate a bank letter for your account within the app.
Please make sure you have downloaded the most recent version of the app, then navigate to the 'More' tab and select 'Settings'. From here, you'll select 'Bank Letter'.
From the web app, navigate to the 'Account Info' tab and you can select 'Bank Letter' at the top right corner of the screen.