Preview button does not show up on Edit Calendar Export page?

Hi,

According to https://www.ownerrez.com/support/articles/custom-ical-links there should be a Preview button to the left of Prefill button if I were to use Fields to customize the iCal content.

However, I am not seeing the Preview button as indicated in the screenshot of help article.

Is this an issue with OR or expected behavior? How can I preview my field codes are done correctly?

Thank you,

Maria

The Preview button will only show if there are bookings that can be previewed.