No worries at all. I don’t consider myself very experienced with it either haha.
Check out this wiki on manipulate a window action. Under subheading 2. Window Choices it mentions the index number method.
See also this macro that will give you all the properties of the current front window. You can run it from both the playlist window, and the media window to verify what their titles are, as well as other properties that may help you figure out how to manipulate each one independently from the other.
One more thing…
I don’t believe this to be the case. The playlist window appears to be title “Charles in charge s01e01.mkv” which may or may not be different from the actual media window. But the point is the titles may not be what they appear to be. You can verify this with that macro I listed above.