Question concerning visibility of shwon Handouts, Characters etc.

Hello people,  I have a short question, I couldn't find the answer to (as I had no idea how I should really search for it.) I finished a campaign and want to run it again with a different group. Is there a way for me to take away all the "visibility" of Handouts etc without opening each Handout etc. and deleting "All Players" from the "In player's journal" slot? Thank you for any help you can give me.  PS: Sorry for my bad English, it isn't my first language. 

You might be easier to just remake the game for a new group.

I think there was an api script posted here within the last couple years that could do that, but it would require a pro subscription to use.  However you go about resetting the game, I would recommend that you don't use the reset version to run games.  Keep it around and simply copy it when you want to start something new.