Remove Primary flag in email address section of person screen

Summary

Inside My client Groups >> Person screen >> edit email address , I need to remove or disable primary flag , I tried from sandbox , but could not see this as child component of table, please advise

Content

Inside My client Groups >> Person screen >> edit email address , I need to remove or disable primary flag , I tried from sandbox ,

The table is inside a popup , when I extended popup , I could see application table, But inside table, I could not see column name as child component,

 

Any suggestion on how to achieve this please

 

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Version

21A