Hello Laetitia,
by default, Gantt chart isn't enabled in a Board, unless your organization configures it differently.
To enable the Gantt chart manually in a single board as a Board Owner, go to Settings:
Then, go to General.
As the last step, enable Gantt by clicking on this button.
Best regards,
Katarzyna Bobrowska
Hello Laetitia,
by default, Gantt chart isn't enabled in a Board, unless your organization configures it differently.
To enable the Gantt chart manually in a single board as a Board Owner, go to Settings:
Then, go to General.
As the last step, enable Gantt by clicking on this button.
Best regards,
Katarzyna Bobrowska