I am trying to figure out what should the "Data Panel" option (see image below) enable/disable when I am accessing the Web Player (in Edit mode). I've tried enabling/disabling it but nothing seems to change (or at least, I am not seeing it).
This is my Web Player node in Edit Mode:
Edit
Enabling/Disabling the "Data Panel" option, does show an additional icon on the left-hand side of the Web Player. (Thanks to Mark P.)