How do I remove a Re: [Proton Mail] "Re: [Mail Plus] Safari: Encryption" from my mail?

How do I remove a Re: [Proton Mail] "Re: [Mail Plus] Safari: Encryption" Is has become an issue I am having with my email Proton Mail when I tried to compose an email with the proton team?

I did not give permission to Safari or Apple to be adding this statement on my Subject line on my compose Proton Mail.

[Re-titled by Moderator]