You are unable to view the calendar when editing the expiry date of an external profile.
When an Administrator tries to edit the expiry date of an External Enrollment Profile and clicks the calendar to edit the expiry date, the calendar does not appear.
The issue occurs due to the following:
Click Start > Settings > System.
Under the Scale and layout section, use the drop-down list. Change the settings to 100%.
Change Display settings
Restart the computer.