Team Viewer not showing second screen

I am using Teamviewer in my mac to connect to a PC, the idea is to be able to see the second screen of my PC in my mac, as if it was a secondary monitor. The problem is that in the Teamviewer when I go to "Views" the option "Active monitor" is not active. So I can't choose to visualize remotely the second screen and keep in my PC the first screen.