Newsflow can be moved to any Desktop, by using Mission Control. You can simply drag and drop the Newsflow window.

You can also assign Newsflow to a certain Desktop, with a secondary click on the Dock icon by using the Options sub menu. Even if you like you can assign it to be shown on All Desktops.

Prefernces / Genearal / "Show on the right side of the screen" is an available option to stick the app to the right side of your screen.
Category: News, Feedly, Feedbin, RSS
Compatibility: MAC OS X Yosemite, El Capitan
Newsflow: News Reader for Mac OS X (Yosemite, El Capitan)

Newsflow brings news from all of your favourite websites right to your desktop. Enjoy your articles in a fast, fluent and highly customizable news reader.