This is the list of the available tones (note that if you can't find your preferred tone, you can always describe it by selecting the pen to describe).
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Auto (Match Original)
Academic
Assertive
Awestruck
Bold
Candid
Cautionary
Casual
Compassionate
Convincing
Critical
Curious
Dramatic
Earnest
Engaging
Enthusiastic
Encouraging
Excited
Feminine
Formal
Friendly
Funny
Grumpy
Humble
Humorous
Informative
Inspirational
Joyful
Masculine
Neutral
Optimistic
Personal
Pessimistic
Professional
Sarcastic
Secretive
Sincere
Surprised
Thoughtful
Urgent
Witty
You can also change and set the default tone by going to settings and selecting the default tone. This way, you won't need to select it manually every time while generating.