How to edit unsubscribe link text of mail in campaign ?

I want to edit unsubscribe link text as previous email builder in campaign. Now I can only add text before or back of unsubscribe link, but I can’ edit unsubscribe link text itself.

That has been locked down. No edits available anymore.

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Thank you for your message. I understand it. If you know, please let me know why, we can’t edit it.
I have to explain about it to my customer.