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Showing estimation field on the edit issue screen

 Due to way JIRA works internally the estimation field has to be visible on the edit issue screen for all estimated issues. Managing JIRA fields visibility is a tricky task but the following articles on JIRA documentation will be a good starting point:

1. Configuring a screen's tabs and fields.
2. Associating a screen with an issue operation

You can omit this step if you don't want to save estimations during your poker sessions.