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Deleting a dataset removes its rows and the dataset metadata. Widgets that referenced the dataset show Data source unavailable until re-wired to a different source.
Deletion is permanent — there’s no Archive recovery for Custom Data. Download the CSV back from the dataset preview first if you want a backup.
1

Open Custom Data

From the sidebar.
2

Open the dataset's menu

Click the three-dot menu.
3

Choose Delete

Confirm when prompted.

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If the dataset is in use

Oviond warns you if the dataset is referenced by any active widget before deletion. Review the list of dependent widgets — you may want to swap their data source first rather than leaving broken widgets.