You can change it by pressing AND holding the EDIT button and the ENV button.
With the PARAMETERS (< and >) buttons you can toogle between page 1/2 and 2/2 as usual.
Without holding down the EDIT button you (just) enter the so called "Easy" mode, where only e.g. AMP Attack, Filter Attack and Filter Env. Amt. is shown.
Little bit tricky though
-Cheers LQdb