If we’re talking about the three boxes on the top right in a little row together, they should be blank (there are no required other knowledges). It should just require that you have (at least) three knowledge points and then you should be able to open it. It should just require you to select the knowledge and then click on the button at the bottom right (greyed out in the first screenshot, because I’ve already opened it). I’ve had some inconsistent behaviour with this in recent chapters, so it’s worth trying to click on it, but also try the hotkey as an alternative (marked on the button, I think ‘F’ is still the default but whatever it is the button should say).

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