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This function capitalizes the first letter in each word of a text string.
PROPER(text)
[Required] The text argument can be a string, a formula that returns a string, or a reference to a cell containing a string.
This function capitalizes letters that follow any character other than a letter, for example, a space. This function converts all other letters to lowercase letters.
PROPER(D2)
PROPER("INTRO to SPREAD") gives the result Intro To Spread
PROPER("Tom's one-time order") gives the result Tom's one-time order