This is not a limitation of Linnworks.net. If you split the packaging on the order it will automatically give you separate labels for each package when you print.
There is no need enable or disable the split packing per service option as this is done automatically now If you need separate labels.
I cannot find anywhere on the Linnworks.net UK Mail integration, where I can specify that a service is splittable, in order to get multiple labels.
We have an existing account where the integration was done in linnworks desktop and with that there is a simple checkbox to make a service splittable.
We are now setting up a separate free account and linnworks desktop automatically takes me to linnworks.net for the integration and I can find nowhere to specify a service as splittable. I am assuming this is just another limitation of linnworks.net.