In the new issue view the user doesn't have the option Export this issue in another format as it was available in the old issue view.
- Select a project.
- Chose Issues and filters.
- Select an issue.
Create for the new issue view a way to export in another format.
Create a search JQL like Issuekey = NP-6 (example), in Search issues and export.
- Navigate to Issue and filter.
- Select Search issues.
- Write a JQL like Issuekey = NP-6.
- Export in Export this issue in another format.