Chromebook to Windows 10 and multiple monitors

I am trying to use my Chromebook to remote into a Window 10 computer connected to a second screen. My Chromebook is also frequently connected to a second screen. When I try to view both monitors simultaneously, I cannot extend TeamViewer across the two screens. I also don't seem to have the option to view monitors in separate tabs, which I've seen elsewhere. Is this option not available on TeamViewer for Chromebook?