I was unable to reproduce the issue on the same combination of software. You can check and try these aspects:
- Click the Home icon (the house, the first icon in the icon row underneath the phpMyAdmin logo).
- Test the same on Firefox to exclude that it is a browser issue.
- Verify that your Plesk login URL is equipped with a valid SSL certificate and that the URL does not need any exceptions in the browser for displaying secure content.
- Clear the cache of your Chrome browser, then reload the page.