...
Remote work or global planning sessions always require an up-to-date data set. Enable this feature and changes to your tasks made by other team members will be instantly visible. When one of the task's fields is updated, the change will be indicated by highlighting the updated field value presented in the Gantt's task lists and the task moved accordingly if start/end date synchronized fields are updated.
...
Security and access
Jira admins BigPicture Admins can access the Live sync page:
...
When one of the task’s fields is updated, the change is indicated by highlighting the updated field value presented in the Gantt module task lists. The task moved accordingly when the start or end date synchronized fields fieldfs are updated.
The minimum live sync interval is 1 second.
...