how to locate the specified comment and make it selected after opening the document in edit mode?
Hello again @xisheng
You can go to any specific comment by opening navigator and then select your preferred comment by just clicking on that list item 
Thanks
Darshan
Thank you for your reply! Can this operation process (navigator ->eComments ->select comment) be implemented using the PostMessage API or other code?
Currently, there is no SelectAnnotation API in the PostMessage API. PostMessage API — SDK https://sdk.collaboraonline.com/ documentation However, if you think this feature would be helpful, we encourage you to file a feature request in the Collabora Online GitHub repository.
We recommend exploring our support and subscription model if this is an urgent requirement. Our team can assist you with tailored solutions, including API enhancements. More details are here: Collabora Online Engineering Support.
For further assistance or discussions, feel free to reach out. We’re happy to help! 
Thanks,
Darshan
Well, thank you very much.
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