Question about THE Grandeur REL. SAMPLE off

As they said in the manual of THE Grandeur piano,

If REL. SAMPLE is switched off, with the DECAY switch will change to a fader that controls
the release time of amplitude envelope of the dry samples.
Does anyone know where the DECAY switch?

Also, I mainly just want to make the note played longer without using the pedal, which can actually be done in THE GIANT, like this:

There's a DECAY slider and really nice to use. But I couldn't find a similar function in the rest pianos.
I think the original samples sound not that bad as people talked online, but I do need this to make it sounds better while directly playing it live!
I'm new to this, please help me! Thanks!

 

Click on the arrow next to ANATOMY text label. Then disable Release Samples button.

 

I did turn it off, but still didn't see a DECAY switch. Or did I misunderstand what they said in the manual?
Even I dragged the slider after turned rel samples button off , it didn't seem to change anything.

 

Same exact problem here... no "decay" setting... what's going on?

- Mario