In the SendGrid dashboard for your account, you can change the setting to determine if the cancellation appears or not. This is a global setting change.
Or, when you create a message (depending on how you create it), you can determine whether a link to unsubscribe appears or not. For example, if you use the SendGrid C # library, this option is available. It is not available if you create a message through standard SMTP libraries, for example .Net MailMessage class. This is a change of settings for each message.
There is no default way to change how an unsubscribe link appears AFAIK other than CSS formatting.
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