Web Pages in Designer Pro X9

[Rik]

1. If I open up an ordinary page, and then want to convert it to a web page, how do I do that?

2. And is there a way of opening up a web page so that what's not the page (the background) is of a different colour to the page itself?

In fact, what Designer Pro x used to look like.
This is only a personal preference but I don't like the new look, when you open a new web page.