You can find options for the project-wide handling of chord diagrams and different components within chord diagrams on the Chord Diagrams page in Note Input Options.
The options on the Chord Diagrams page include whether or not to include the root note in chord diagrams, as it can be useful to omit root notes in chord diagrams for the guitarist in ensembles with a bass player, and whether or not to include particular scale degrees depending on the chord symbol, such as omitting the fifth in dominant seventh chords.