What is the equivalent command in Power Query for changing the case to proper in Excel?

The equivalent command in Power Query for changing the text case to proper is indeed found under the pathway Transform > Capitalize each word. This option is specifically designed to transform the first letter of each word in a text string to uppercase, while the remaining letters are set to lowercase. This function is useful for formatting names, titles, or any text where proper case is needed.

The functionality of transforming text to proper case is not found in the other options provided. For example, while "Change Case" might imply a general case change, it does not specify that it pertains to proper casing specifically, and thus could lead to confusion. Similarly, "Alter Text" and "Case Conversion" do not accurately describe the proper case formatting, indicating broader or different functionalities. Hence, the clear and defined path to achieving proper case formatting in Power Query is through the command to capitalize each word.