In WooCommerce admin product pages general settings, a checkbox enable or disable some additional quantity setting fields that handle minimum, maximun and step arguments at product level (showing or hiding the setting fields dynamically):
When checkbox is unchecked, quantity setting fields are not visible and disabled:
When checkbox is checked, quantity setting fields are visible and enabled for the current product:
Note: All settings are merged in a unique custom field as an indexed array of values, to improve performance.
Also this works nicely on "Ajax add to cart" for simple products, for product variations from variable products and also on the cart quantity input field.