Thanks GregValian
The disallowed area explain the issue
BTW the json file is at .../Ultimaker-Cura.app/Contents/Resources/share/cura/resources/definitions
I went back and look in my older laptop and indeed was using: Ender 3 Pro, the v2 was not listed in Cura 5.0,
only Ender 3, and that one already had those disallowed area
That brings another question
I did try to copy and paste start and stop G-code in machine setting window
but copy and paste does not work
I can type and delete directly in the window, that works, not copy and paste , not with a right click, not with the global menu
I am saw a demo done on a Window pc where that works
Is that normal on Mac, intel or arm, it is the same?
Any way, now I can do it in the json file, so no biggy
Thanks for the help