I am sweating upstairs. I want to exchange ingredients with my friends. My own ingredients can be unlocked without entering the menu. Besides, the second point you said is that you can't change your back tomorrow. You can't change the previous A, because after you exchange ingredients with each other, the system will automatically lock A. It's no use going the next day unless the other party unlocks it.

Situation A: You go to your friends to exchange ingredients. After you enter his restaurant, click the icon to unlock the ingredients, click the ingredients you need, and then select the ingredients you want to exchange below, but they must be of the same grade or high grade. For example, if he is a three-star, you have to use a three-star, four-star or five-star one. If you click the icon to unlock the ingredients, it will pop up blank, indicating that all the ingredients of the other party are locked.

Situation B: If you want to change the ingredients locked by your friends, click the icon to change the locked ingredients, select what you want, then select what you want to change and tick. But this can only be changed if the other party agrees.

Situation C: If you want your good friend to change your ingredients at will, just go into the menu and unlock your dishes, or you can lock them all if you don't want to.

I'm at level 27. If you have any questions, ask me.