Hi!
We're using JIRA Cloud and we really like the new UI. On a Kanban board of one of our projects there're the Quick-add buttons (as explained in the documentation) for attachments, subtasks, and link issues:

But in another project the one button for creating subtasks is missing:

The project configurations are not equal but quite similar. We looked at board configurations, issue type schemes, etc. but we couldn't find a setting for this.
Any idea how to get the sub-task button back?
best regards,
Sebastian