Page History
...
- Go to Issues>Search for issues
- Click and open the Issue that you wanted to view the issue id
- Mouse-over the Edit button and you can view the issue id at the bottom of browser as shown below:
Related articles
https://confluence.atlassian.com/jirakb/how-to-get-issue-id-from-the-jira-user-interface-8273414281115156394.html