Tone selects a single frequency. Sweep selects a range of frequencies (instead of a single tone). Mute turns on/off the generator. Level determines the generator output level. Frequency determines the frequency for Tone. Start Frequency & Stop Frequency determine the range of frequencies for Sweep. Frequency Interval selects the spacing (and quantity) of individual tones for Sweep. Time Interval determines the time each tone is held for Sweep.
Right-clicking over certain settings will provide a menu of additional options.