Removing Connection does not clear GMail email

Replies: 0

Hi,
I want to change the From email I used to setup WP Mail SMTP but can not do so because the From Email and From Name are grey-out.

I understand that Removing the connection should allow me to do what I want but even after removing the connection or indeed changing to another Mailer all together does not clear the From Email or From Names or allows me to reset them.

Thanks for your help