You can delete and cancel the schedule both on the old portal and on the preview. However, you cannot edit the time or frequency of the schedule. Please vote for it on UserVoice so the product team can prioritize.
To disconnect from the old portal, select "Worksheet"> "Click Schedule"> highlight the schedule for deletion> click the "Disconnect" button in the lower right.
To delete a schedule on the old portal, go to "Assets"> highlight the schedule for deletion> click the "Delete" button at the bottom of the screen.
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