I think at the home screen of the game it should say play and when you click on that it will give you 3 options
1.online - Normal game
2.adventure - Meaning the adventure they made (it's in the lobby)
3.creative mode - you would be in an offline world with every block and you can build anything and you have every peice of clothing but nobody can be in the world except you so it's offline so you can't sell stuff.
Do you like the idea comment down below and tell me.
And if you don't understand please just ask and I'll reply