Station Construction GUI

[SkeedR]

Ok, I wasn't quite sure where to put this, so it's here.
I'm having difficulty finding a switch that i know exists. It modifies the station construction window to show previews of the station. If needed, I'll add a screen shot to show what I mean.

Thanks for any help.

[eis_os]

ExperimentalFeatures Alpha

[SkeedR]

T_T No wonder i couldn't find it. TTDp doesn't add the experimentalfeatures.[whatever]
It's just got experimentalfeatures on.
Thank you very much eis_os.