My DD1 is 5 (and DD2 is 1).
When we have friends over with kids, they seem to empty everything out. Everywhere.
Games with lots of bits.
Jigsaws.
Figures.
Toy food.
It basically looks like we've been burgled.
They don't seem to play with 80% of what they empty out.
It drives me INSANE.
I don't show it.
Kids make a crappy effort at tidying up - you know, the long stuff into random boxes so that everything is jumbled up and none of the games / jigsaws have the right bits together.
What are you supposed to do? Suck it up as par for the course? Give your own DC a pep-talk about what not to do? Helicopter around them asking them not to do stuff?
What do you do?