Hi @MT090511 ,
Do you want to list all the lists in a gallery?
Could you tell me which one is your data source? Microsoft To-Do (Business) or Todoist?
I assume that it is Microsoft To-Do (Business).
If so, you need to do these:
1)connect your app with Microsoft To-Do (Business):

2)insert a gallery, set its Items:
'MicrosoftTo-Do(Business)'.GetAllTodoLists()
Then you will get all the lists in your Microsoft To-Do (Business).
If you want to get all the tasks based on one specific list, I'm afraid it's not supported by using this connector.
This connector currently only supports these actions:
You could only get a specific to-do task based on the task ID.
Best regards,