Items under the Text Functions menu are used to manipulate text.
Upper Case converts the selected range to all uppercase text, i.e. THE QUICK BROWN FOX.
Lower Case converts the selected range to all lowercase text, i.e. the quick brown fox.
Proper Case converts the first letter of each word in the selected range to uppercase, i.e. The Quick Brown Fox.
Capitalise converts the selected range to an initial capital letter followed by all lowercase letters, i.e. The quick brown fox.