Enhancement: Option to hide completed tasks in the navigation sidebar #3100
Description
Is your feature request related to a problem? Please describe.
When tasks are marked as completed, they remain permanently visible in the left navigation sidebar (under the respective calendar/list). Over time, this leads to a cluttered sidebar where completed tasks mix with open ones, making it harder to get a quick overview of what still needs to be done.
Describe the solution you'd like
An option to hide completed tasks from the left navigation sidebar — similar to how the Deck app handles archived cards. Ideally this would be a toggle (show/hide completed tasks) either per list or as a global setting, so users can choose whether completed tasks should be visible in the navigation or not.
Describe alternatives you've considered
- Moving completed tasks to a separate calendar manually — works but requires constant manual effort
- Deleting completed tasks — not desirable if a history is needed
- Custom CSS workaround — fragile and depends on internal HTML structure
Additional context
The Deck app already implements a similar concept for archived cards, so there is precedent within the Nextcloud ecosystem for this pattern.
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