However, my attempts using your instructions did not work.
Because you did not follow my answer, which stated in 1.Formatting your cell as Text, that you must not format the cells as text before you enter a formula, but you have Format Code: "plane "@
, which clearly is a text format code and hence you get your formula as text. Remove the format and add the following formula:
="plane =" & $D$20 & E9 & $E$18 & F9 & $D$21
–or–
="plane " & $D$20 & E9 & $E$18 & F9 & $D$21
(not sure what you want)
See the update in my answer
> I began using Excel in 1986 and have hundreds of specialty spread sheets on my Mac and never encountered this formula display problem
… and now you are using LibreOffice Calc, which isn’t a clone of Excel.
> Surely there must be a way to eliminate it?
Yes - see the answer above, and even if you can’t imagine, there are users (like me) who love the option to quickly show the formulas being used in a sheet.