Two levels: cancel a Marcus action or uninstall the app.
During the 60-second grace period, a “Cancel” button is available for every approved action. After that, the action executes and cannot be cancelled — only rejected before approval or handled manually afterward (for example, cancelling a purchase order with your supplier).
Uninstalling from Shopify immediately disables the account and revokes access. Your data remains stored while you decide whether to reinstall — reinstalling restores your history without re-entering everything.
For complete and permanent deletion of your data, see Data & Privacy.