From where the pop up appears on workspace and how to add the field in the pop up.

[Advaitk]

Hi everyone,
In the Security Incident workspace, when we change the State of a security incident record to Closed, a pop-up appears prompting us to fill in mandatory fields. In that pop-up, there is a section that includes the Close Code field.
I would like to add a custom field below the Close Code field in this pop-up.
Could someone please explain:

• How this pop-up is triggered (what controls its appearance)?
• How can I customize or edit the fields shown in this pop-up to add my custom field?

Thanks in advance for your help!

[Martin Virag]

I personally have not worked on this but I would review how the close code and close notes are used here (since these are input types) an event gets its parameter. Strangely for me all the handlers written that the handler is not valid.