Hi Elliot,
Not sure if I understood your question correctly, but you can enable/disable open pricing for each product individually (there is “Product Open Pricing” meta box on each product’s admin edit page). Or do you mean you want to enable/disable open pricing in bulk (e.g. by some product category or tag)? If that’s the case – unfortunately applying it in bulk is not possible at the moment, but I could probably add it in next plugin version.