How to stop a scene from resetting

I'm making a zombie survival type game and it involves an inventory. I made it so that if the player taps a bag icon, then it swaps to the inventory scene. This works, but when the player goes back to the main game screen, all the actors have reset. Is there any way to stop this from happening?
(If there isn't, is there any way for the inventory to appear and disappear from the main game screen?)
Any help would be appreciated, thanks . (I am using the PC version of GS, if that makes any difference.)