How do I change the source of my Calendar from 1 sheet to a report?

I have created a calendar in the Calendar App that is built off of 1 sheet, however, I discovered I wanted to include a second sheet in the Calendar App. I created a report, but how do I change the source in my Calendar App from the original sheet to the report?
Or do I have to create a new calendar that uses the report and delete the original calendar app?
Answers
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You'll need to create a fresh, new Calendar selecting the Report as the source instead. Then, yes, you can delete the previous Calendar if you no longer need it!
Cheers,
Genevieve
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I created Calendar app about 1 year ago and I can't remember what was the source sheet. I just checked settings but I'm unable to identify. How can I figure out what was the source?
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In the Calendar itself there's an option to "Open Sheet" which will bring you to the source data:
Cheers,
Genevieve
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Thank you @Genevieve P.