If some fields are hidden in the Issue Navigator in Jira, you can follow these steps to find and display them:

1. Navigate to the Jira dashboard.
2. Click on “Issues” in the top navigation bar.
3. In the drop-down menu, select “Search for issues”.
4. This will take you to the Issue Navigator.
5. On the Issue Navigator screen, click on the gear icon labeled “Columns”.
6. In the “Columns” dialog box, scroll down to the bottom and look for the “Custom Fields” section.
7. Click on the expand arrow or the link that says, “Add all custom fields”.
8. This will reveal all the hidden custom fields available in your Jira instance.
9. Check the checkboxes next to the custom fields you want to include in the search results.
10. Click on the “Apply” or “Save” button to apply the changes and display the selected fields in the Issue Navigator.

By expanding the “Custom Fields” section in the “Columns” dialog, you can reveal and include any hidden custom fields in the search results. This allows you to view and work with the additional custom field data in Jira.

Please note that the availability of custom fields and their visibility in the Issue Navigator may depend on your Jira configuration, project settings, and user permissions.