I want to hide postal code/zip code from checkout page
The only you can do this I am aware of is if you are selling items which do not require shipping.
In which case, you must uncheck the “This Product Requires Shipping” checkbox on each product, then the shipping details won’t be required at checkout including zip code, only the billing information. Otherwise I do not believe it will be possible.
Hope that helps!
@biznazz101