I have been looking for the location of the online manual for Prusa Slicer. I can find Slic3r, but not our baby with all its bells and whistles. Specifically, I was looking for something in help where I could look up a button I didn't understand: In sliced view, where you set layer height view (for setting filament/color change), at the bottom is a lock that says, when you hover over it: "One layer mode" which I don't understand. I can't seen to find any more detail about it anywhere else.
So, can you help me by sharing/pinning a link to the manual (where, ostensibly, the answer to this question can be found) or provide a further explanation of "One layer mode" in that lock icon?