Why is the card browser showing html code while when learning the same cards the html code is rendered?

I am seeing this picture in the Extended HTML editor plugin help
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To me this implies that there is a way to see the card and edit it in a WYSIWYG manner.
On top of that the plugin allows you to see the HTML code like in the picture

Am I getting that wrong ?
Also my understanding is that Anki has a default built in editor that should see the same (the rendered card not the HTML code)
It is true that you could also see that in the preview