Is the separate definition column gone? Replaced by popup?

Since this morning, I seem to be getting a popup and nowhere can I find the option to make sure that when I browse words with the arrow, I get the extra column with definition. That space is now occupied by a big white empty space.

Did I miss the option to set the definition column in stead of popup? Or is this a change someone desired?

EDIT: I was wrong. The column was hidden behind a small arrow that I overlooked. I did notice that i get more data in the column than before. As soon as I filled in the definition (before), I used to have only definition and notes. Now a lot of other stuff is there as well. I wonder if this is optional.