The field due date will be shown on an issue screen only if the user has the Schedule Issues permission. Also you need to add the due date field to the screens on which you want to see the field.
For marking issues you would need an add-on like Colors For Jira add-on
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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