Feature request: Add fullscreen mode and split view for editor

Writing longer answers on community-solutions is currently a bit cumbersome in my opinion. Especially for more complicated expressions I usually like to regularly check the preview. Whenever I have to do so, I first need to scroll up, press "Preview", then switch back to "Write" and scroll down, etc.

It would be cool if the community-solutions editor supported the following two things:

1. A third tab "Split view" (or similar) that would display the editor and the preview next to each other.
2. To faciliiate (1) some kind of fullscreen mode where the editor fills the entire (or most of, except the header maybe) the viewport.

Would love to work on this.