Hello @Niu Niu,
Welcome to the Atlassian Community!
The tasks on the timeline are currently ordered by Issue Key/ID and it’s not possible to change that.
There are some filters available, but they won’t change the order of the tasks as well.
There is a feature request suggesting the ability to sort the issues based on start/end date:
If that’s the same that you need, please, click on vote and also watch to receive updates about the feature.
If it’s not, please, let us know more details about what and why you need the feature to reorder the tasks on the timeline, so we can raise a new feature request.
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