If you are a Paratext user, and if the project(s) in question are already on Paratext's server (by using Send/Recv), then all you need to do is to run Send/Recv for those projects (first on the old machine, and then on the new machine) in order to get the PTXprint settings.
If the above conditions are not true, then navigate to the "My Paratext 9 Projects" folder and select the appropriate project folder. Within that there will be a shared\ptxprint folder. Copy that over to the same location on the new machine, and it should all just keep working as it did earlier.