On the quotation page, if i go in a quotation i can send a mail using the "send by mail" button.

However a button is added before the footer of the email body that redirects to the customer portal. It looks like it's added no matter what template i'm using.

Is there a way to remove it? I also tried changing  some of the odoo core code in the mail and sale addon folder but without success

I'm Using odoo v13