Do you mean that you want to make internal comments by default? We found only one way to do it is to use JavaScript. But it is a bad solution.
Can you please provide that solution?
You can find such a script here
https://community.atlassian.com/t5/Jira-Service-Desk-questions/How-to-change-default-tab-to-internal-comment/qaq-p/56715
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