I returned to the endless forest and I often find players that are laying down? Why do players AFK like this?

I know that pressing the letter P on my keyboard is supposed to take a screen shot apparently, (according to google) But nothing seems to happen after pressing it and I have no idea how to access the screenshots anyways, A blog said to find the local disk drive, And didn't explain how to find it, I'm very confused.

The ground is a dark green, with the sky being vertically striped cyan blue and white, I am so confused, I remember playing with a forest with grass and textured ground and patches of flowers, I see none of that,
I also found the occasional afk players, is this a problem with my computer? Or the game, How should I fix this?