Adjust Items To Show in slider

Hi,

I want to build a slider which shows 4 slides at once, but I can’t find the setting for that.

I guess it should be possible, since there’s a line under “effect” that says “Fade, Cube, and Flip require Items To Show set to 1”. In my case, I want to change “Items to show” to 4, but I can’t find that setting…