This was a bug and it was resolved in NPrinting June 2017. Please upgrade to latest version.
Only ten destination folders were available in drop down list
Jira issue ID: OP-4718
Only the first ten (sorted alphabetically) destination folders were available in the drop-down list in Qlik
NPrinting Publish tasks.
Now, the maximum destination folders has been raised to 10000 and the maximum number of
available folders in dropdown list is set to 1000.
If you need to create a different folder for each user, consider the use of %%User_Folder%% and
%%User_Subfolder%%. This is easier than setting up different folders and assigning them as
destinations one by one.