Can you provide a sample workbook?
Option 1: Quickest one
Right click and hide the field label for rows. See the screenshot
Option2: From Analysis menu tab. It'll also do the same though few more steps you need to perform.
Go to Analysis > Table Layout >ShowField Labels for Rows (Un tick) that
Here you go:
Let us know if this help.
Unless I miss something, this affects all columns, not just one.
I got it what you mean to say
Use floating blank object an place it over "Region" field label
Or rename the "Region" dimension with "." to to hide it.
Let us know your observation