Where can I change to book view in windows?

at present I have a huge white space with no margins (windows version).

I want it to look like a page of a book when writing, or at least create margins that are not unweildly.

how can i do these things?

Hello Carlton,
Tools / Options / Editor and on the right of the menu box there is an adjuster for the margins which can be set in points.

Are you in full screen composition mode (F11)? If so there are various options to adjust the screen space. Drag your mouse to the bottom of the screen and you can adjust the writing space width to how you prefer. You can set the opacity of the background or even select a background image to suit your project ( Top menu View / Full screen backdrop.