How can I do it on the different platforms?
Slide with 2 fingers (right to left) and the same to have back the Enhanced Version.
Press the Back button on your controller.
Press F1, or press Page Up for Classic Mode and Page Down for Enhanced Version.
Press Select button
F10 works to toggle between modes on PC.
On the PC version, press F1, or press Page Up for Classic Mode and Page Down for Enhanced.
On iPhone, slide with two fingers right to left.
On PS3 you just have to press SELECT