I can see the "types" I want in the "Issue Types" section of the project settings. I have no problem so far. But I couldn't find how to change the "Field Configuration" part in the attached picture according to "Type". There is a separate "Field Configuration" setting for each "Screen". There are different mandatory fields.
https://community.atlassian.com/t5/Jira-Software-questions/Subtask-Alternative-Field-Configuration/qaq-p/1969672
I found your answer.
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