The Case Rule allows users to choose whether letters appear in lower, UPPER, Sentence case, or Title Case.
Sentence case is when only the first letter of the first word is capitalized: This is in sentence case.
Title case is when the first letter of each word is capitalized: This Is In Title Case.
To apply the Case Rule:
Click the blue wrench icon next to the name of the attribute and then select the Case Rule.
To remove the Case Rule click the purple cog icon and then "x" to remove the rule.