Please, check the screenshot below. The Component field (nFeed custom field type) is actually 80 symbols long but only about 20 are displayed. Is there any way to override this behavior?
There is also
but that may be for earlier versions of JIRA. I think this is likely set in the vm template of the nFeed custom field.
Would this documentation help? https://confluence.atlassian.com/display/JIRA/Changing+the+Size+of+the+Text+Area+Custom+Field
You can change the size for specific custom fields. (in this case the nFeed field)
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