I got annoyed with not being able to set this preference on my own account, as others within my organization like collapsed comments, so I wrote a Greasemonkey/Tampermonkey script to auto-expand these for me: https://greasyfork.org/en/scripts/29233-atlassian-jira-auto-expand-older-comments
Administration >> System >> General Configuration >> Advanced Settingsand modify the jira.comment.collapsing.minimum.hidden to 0
I am not seeing where to change that setting. What I am seeing at the bottom of that page where "ADVANCED" is shown on the left side is:
The version at the bottom that admin page is:
Atlassian JIRA Project Management Software (v7.1.7#71011-sha1:2526d7c)
This is hard to find, but I found it.
As an Administrator, click Jira Icon in upper left of your browser window.
Then Settings -> System -> General Configuration
Now here's the tricky part: look to the upper right for "Advanced Settings" button
Then you scroll to the bottom to find the jira.comment.collapsing.minimum.hidden and set it to 0.
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