View the original community article here
Last tested: Sep 12, 2017
Since creating new projects generates LookML files, the schemas option declares which schemas to generate files from.
If you have 2 schemas you want to generate files from, you'd enter them in comma separated format (i.e. schemaone, schematwo) in that field
If you leave it blank, LookML files are generated using the default schema, which is listed as the database in the connection settings.