If you are using JIRA Cloud, I would recommend you to reach directly to the Support Team to found out why the panel is missing.
If you are using JIRA Server, check the link below for some tips to troubleshooting this issue:
Same for us. Is it possible that there was a JIRA release that could have caused it to disappear? We are also on JIRA Cloud and did not make any changes recently that would have caused it to disappear. I noticed that we our Development Integration Plugin was disabled and why trying to re-enable it, it is telling us that there is an error preventing it from doing so.
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