Q&A: Is there a limit on the to-do list?

The To Do list widget will display a maximum of 40 entries.

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Although, 20 is the limit for each category.
E.g. 20 tasks, 20 events, 20 1-to-1s, 20 surveys
So if there are 20 tasks but no 1-to-1s/events etc, then the widget will only show 20 entries.