I'm a bit desesperate...

Earlier today, I read somewhere that you could change the size of the dialog box with the touchpad and R3 durrings cutscenes... I played around a bit and it worked, except that it put it to the smallest size...
Now, i tried to reproduce what i did and I just cant I'm not sure if it a question of timing of pressing the button but now I can't really play unless I read the logs in the chat box...

Can anyone help me ?

ps: I did search and google it but I only get result from around feb 22-23... which nobody know how...