Recent versions of Compass have been setting directConnection=true in some cases (namely, when connecting to a single host without an SRV connection string, and without replSet or loadBalanced options). Compass no longer has this behavior, and will instead not add a directConnection parameter to the connection string without the user’s knowledge. This means that when the intention is to connect to a single node of a replica set, users will need to explicitly specify directConnection=true in the connection string.