In the upper part of the window you will see information about the loaded work center.
There is also a button called Search via Planning Board... that is linked to the priority planning window. Here you can see a general overview of several work centers and quickly switch work center to see that work center's priority plan. In the top right corner you will find the section Info. Here you will find information about the priority plan's mode or layout.
There are a number of filters which show information about different operation categories, and which are used to determine which operations should be shown in the priority plan. You can make a supply analysis in order to see which operations that can be run according to the priority plan's New finish.