The Dictionary feature can be used to configure Sapling to ignore correcting certain words and phrases. Users can add to their dictionary at https://sapling.ai/dictionary.
Users with Teams can also add words to a Team Dictionary at https://sapling.ai/teams
Sapling will typically identify proper nouns and and non-dictionary words in context, but can mistake jargon that it has not seen enough to incorporate into its language model.
You can import pre-defined dictionaries into Sapling as CSV files using this guide.