Many years ago I used formulae in Word all the time. I am now completely failing and I can't remember what I used to do. I am using Word 2016. I have gone down to the simplest formula I could think of =SUM (1,2,3). When I toggle the field codes off (ALT F9) it is though the formula hasn't been entered.
Hello {{=SUM(1,2,3)}} Try again {=SUM(1,2,3)} end



What one sees after toggling is:

Hello Try again end


The braces were entered using CTRL F9




I'm sorry as it must be something really obvious but I'd very much appreciate any help.