Answer

Option 1

1. Drag Measure Names from Dimensions to Columns.
2. Drag Measure Values from Measures to Detail.
3. Right-click Measure Names on Columns and then select Filter.
4. Click None and then select the fields whose headers you want to display.
5. Click OK.

Option 2

1. Drag Measure Names from Dimensions to Columns.
2. Right-click the header of the column that needs a title. It will likely say No Measure Name.
3. Select Edit Alias.
4. Type the new title and then click OK.

Option 3 (For only one measure)

1. Click Analysis > Create a new calculated field... 
2. Name the calculated field "Title" and in the formula, add the name of the column that you wish to use in quotes. For example:

   "Sales"

3. Drag the newly created field "Title" to Columns.
4. Right-click on the text "Title" and select Hide field labels for columns.

Additional information