If you remove 888 hand history folder from the autoimport settings - it will stay this way. H2N does not change settings automatically.
What it does automatically however is updating the integration module. 888 can work without autoimport, so you will need to remove the module manually and disable autoupdates.
Enable this option:
Then close H2N and delete "Pacific" files from Hand2Note\integration folder. Pacific is the name for the 888 network