Hi. I am new to odoo. I am on version 16. 

I cannot find a place where to edit the code of the email template. 

I have set developer mode, and I went to Email Template. Any template I choose, there is only a reset button. There is no edit code button.

Also, the Dynamic Placeholder does not work. I click it, but no dialog comes out.

Also when I recieve the actual email in my inbox after sending it, the line-high of the lines is too big. I wanted to set it smaller in the code, but again I have no access to the code.

How do I edit the code of the Blank Email Marketing template?

Thanks.