The required planets type should be visible on the tab ‘Requires’ in a separate popup named ‘Product Data’. Since I was wrong, I’ll see what I can do to improve that. I would have thought that anyone familiar enough with PI could recognize the elements quickly. The ‘Planets Plan’ is using similar design/icons to in-game PI. Once again, nobody ever reported this as an issue. Until now I never need it because I simply keep it open in the background or on a second monitor. Your feedback on the dragging problem is valuable. I am guessing the options is not visible enough in the middle of the clutter. The transparency can be controlled from the ‘Tools’ tab.
