* Important: This issue was fixed in version 2.8. Please update to the latest version if you have this problem.
The Calendar dates may not be visible on iPadOS 15 in certain circumstances. A fix for this issue will be available soon.
In the meantime, to be able to select a date from the calendar, with the calendar open, move or rotate the iPad. This should make the calendar appear.
If this doesn't work, please make sure "Rotation Lock" is disabled on your iPad.