I work as an email template developer and I'm building a Custom Editable Marketo Email Template for a company or a organization. I have Marketo Design Studio access. I am able to create a new template and edit the HTML code. But I don't see any option where I can change the HTML version mode to Design mode and check whether or not the template is editable. Whenever I click on an email template name, it directly takes me to the HTML code. But I need an option where I can see the visual output of my code. I'm not sure what kind of access I need. Could anyone please help me out.