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If you are a project administrator or a system administrator, then move your mouse over the name to display additional buttons: edit the group sign-off field definition as well as revert all decisions to re-start a decision, loosing all previous votes:
If you have configured the app to display the group sign-off panel on the right side within the issue view instead of displaying it on the left, the it looks like:
This needs no longer a complex set-up and should make administrator's life much easier.
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