Liam here from Shopify - thank you for your question :)
Great to see you are looking to take control over how customers cn make orders on your store, so let's see how you can set that up :) We do have a guide here which will show you step by step how to use code to set limiting purchase quantities. Alternatively you could use the OrderLimits by Nobokaay or Order Limits (MinMaxify) to get this effect too.
Hope this helps Joanne, if you have any other questions, just let me know!
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