In https://help.libreoffice.org/Calc/Array_Functions#What_is_an_array_formula.3F it says that to make an array calculation you need to confirm with Ctrl+Shift+Return. However, I found that on Mac OS X I need Cmd+Shift+Return instead. Please fix. I suggest adding (Cmd+Shift+Return on Mac OS X) in parenthesis whenever the key combination gets mentioned. Thank you!
CONFIRMING In contrast, the built-in help (at least in French, in my LO5233 FR version for macOS) does indicate the correct key combo. It would appear that this is a limitation of the web help, which is not adapted to OS particularities.
Ah, yes, the built-in help has the correct combination in the English version, too.
This is fixed in the new online help https://help.libreoffice.org/6.4/en-US/text/scalc/01/04060107.html?DbPAR=CALC#bm_id3147273