You can un-cancel an individual class instance but you can not un-cancel a series of canceled classes.
To un-cancel an individual class:
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Select Schedule
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Go to the date the class was scheduled
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If you do not see the class, at the top of the page check the box Show canceled classes
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Select the three dots to the far right of the canceled class
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Choose un-cancel
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Select Show on schedule or Hide from schedule
Un-canceling a class does not reinstate the clients who were enrolled in the class nor is there a way to see a list of clients who were removed from the class.