I'm playing around with workflow conditions, properties, triggers, etc. for the first time. I found a condition that allows me to hide a transition from my Jira users, but the description of this action describes that the transition (when hidden) can only be triggered from a "workflow function". See screenshot below.

Does anyone know what "workflow function" means? My users still need the option to make this particular transition when necessary. But it's not a transition they will use every day / need to see all the time like they do now.
Thoughts?