View the original community article here
Last tested: Oct 25, 2018
Check the General Settings Page for the Block Formulas and Macros in CSV Files toggle.
If fields start with the following special characters, then this feature will snap into action!
=, -, +, or @
>When this is enabled, Looker will add a
'character to any cell value that begins with a special character (
@) when generating a CSV file. This disables all macros in Looker-generated CSV files.