If I understand your concern here, I think you are asking how to change the order of the fields as they appear on the screen. This is something that you can change if you edit the screen where these fields appear. The documentation on Defining a Screen explains this in more detail.
It can be hard sometimes to understand though which screen you are using in that case. To help with that, I would recommend using the Jira Field Helper. A quick way to find this would be to
With this information you can the edit that screen to change the order of the fields that appear there.
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