How the various Traincontroller windows are used is a matter of personal preference. I have a 24" LCD screen for the railway, which is large enough to show everything on one monitor. Some people may use a smaller monitor; some may use several monitors.

I typically have the display configured as sketched here (apologies for the lack of detail but it is hard to reduce the size of this to fit!)

main_window_layout 

On the main window area, one of several tabs can be selected: