- Plesk Onyx
Why are not all the domains shown in the drop-down list when creating a new subdomain in Home > Domains > Add Subdomain?
Such behavior is expected. Number or records was limited to 10. The record "There are .. more objects available" is informative and was not developed as a button or a link.
You can submit a feature request at Plesk UserVoice portal and leave a comment with the desired functionality.