When selecting the four FX mode in Traktor Pro, two FX are crammed together into the same space previously occupied for each one. There is a lot of blank space right next to them - plenty that the controls for the individual FX could easily have been placed right next to those of the first two FX instead of getting that cramped display.
This was bad before, but is particularly problematic now with the addition of the Pattern Player, as there seems to be no way to access the pattern overview area when using four FX.
I propose an option to place the added FX units' interfaces in the blank area next to the existing ones, instead of trying to cram them all together into the space that a single unit normally occupies.