Go to https://app.mangodisplay.com and log in to your account.
Choose the display you want to edit.
On the display window, click the edit button on your To-Do & Tasks widget.
Then click your connected Google, Microsoft or Todoist email address to expand your account. This will show which lists you can select or deselect.
Click the checkbox next to the list (s) you wish to appear on your display.
Click save and you're done!