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Final result of adding an Upcoming Vacations gadget for all teams, as visible by an HR team member:
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The mentioned above message "Team statistics are disabled in configuration. You will be able to see only your own upcoming vacations" does not affect team managers nor HR members as in the presented case, but only individuals from particular team. It aims at protecting privacy of each one in regards to approved leaves. It can be changed by Jira administrator as presented below, under (1):
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