CMP seems to only shows a custom field once an asset has a value for it, and there's no way to set a schema-level default — so every asset created before an app is installed permanently shows no field until something writes to it.

I have a custom checkbox field with simple options/values for 'yes' and 'no'... but the field itself is not presented until an editor adds it. So if I want the editor to select their preference, they need to add the field then set the value every time.

If I could set the default value to 'no' as a default the field would always be shown