There is no option in the Edge Animate UI to set viewport data,anyhow you can open up the published HTML and set the values
Was interested in knowing for what use cases did you want to set meta-viewport ,i mean what ru creating?
I want to set the viewport because I create website that most of the time doesn't fit with default safari's viewport setting (width of 980px or something like that). Isn't it the purpose of the viewport ? to display the most optimized way an html page ?
I was asking because when I change the html, most of the time edge doesn't like it and I get error messages.