How to make the customfiled inactive or hide?
You can hide the field from Field configuration scheme for the particular project.
when the request is closed, a screen with fields opens, I need to write a script on sil, let's say if the performer = x, then hide the field
If you use Script Runner add on, you can do using Behaviour plugin. See some examples here,
https://scriptrunner.adaptavist.com/4.1.3.7/jira/recipes/behaviours/field-readonly-except-role.html
if not the author, and the custom field?
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