Hi @稷康 蒋 - Welcome to the Atlassian Community!
Are you trying to do that in Confluence or in Jira?
Can you include a screenshot?
And you followed this?
https://support.atlassian.com/confluence-cloud/docs/insert-the-jira-timeline-macro/
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Actually, not seeing anywhere that you can modify the timeline in Confluence using the macro. You will need to modify it in Jira and the change should be reflected in Confluence.
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You are welcome and good luck!
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