Make a field "appear" has hidden on the create new screen

Hello everyone!

I’ve followed this thread, with some modifications, to make some fields hide or show depending on the option selected from a dropdown field, but now I want them to “appear” as hidden when the ‘create new record’ page loads, so they show up only when the option’s been already chosen, I’ ve been trying to do something with the displayParams on the editviewdefs.php, but I can’t find the right keywords.

I know another option is to add an onLoad listener and it’s corresponding js function, but I’d like know if there’s a better way to achieve this.

Any help will be very appreciated.