Look at these negative sentences:
Hier je n'ai pas fait grand-choseYesterday I didn't do much
Paula ne pense pas grand-chose de l'environnementPaula doesn't think much of the environment
In French, to say not much, we use the expression ne/n' ... pas grand-chose (literally "no big thing").
Note that you can also use pas grand-chose on its own:
Tu as fait quoi ce weekend? - Pas grand-chose.What did you do this weekend? - Not much.
You can never use grand-chose to express much, this exists solely as a negative expression.
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