It's all a question of how you want to manage yourself.

If you want to be much more precise about the status of the task, you always have the option to mark it as 'not started', 'in progress', 'completed', etc. When the activity in question is open, you can change both its start date and due date, or also turn off the reminder if you are released from this obligation and it no longer bothers you. The first thing will be to open them from the mail client, as we have taught you. Generally speaking, we can say that you need to use the Outlook application to edit the tasks you have previously created in OneNote. So assuming you already know how to create Outlook tasks from OneNote or open them for review from either application, the latter will be understand how to modify those activities. How to edit Outlook tasks created in OneNote? Or you can open activities directly from your email account: Then Start, Outlook Tasks, Open Tasks in Outlook.The first of these has to do with OneNote itself:

There are two main ways to open OneNote Tasks in Outlook. At this point, you should be able to create your OneNote for Outlook tasks in newer versions of OneNote, while the steps change slightly in older versions.

Creating tasks in outlook