Thanks all - Solved! It's option 3) : a change in Affinity nomenclature leading to outdated articles. Judging from the fact people have even made videos on it I'm not the only one having trouble with this having first used Affinity in a V1 trial then bought V2 on Windows.
Notable latest Affinity help (acessed directly from the updated software) now says "Settings (or Preferences)" - which is embedding the confusion. RE: Your point below Thomaso, this isn't rhetoric, or pedantry: in software words refer to precise things you need to find in a menu, and we're discussing software that I'm trying to use and spending way to much timeon basics due to wierd UI. As Affinity have (sadly) cloned the legendarily bad Adobe UI, some of us who are not used to pages of tiny menus scattered over multiple locations have a hard enough time finding and remembering where things are as it is. When I see "preferences" in help I have to look at lines upon lines of tiny grey words in seemingly random menus to find that word. If I was supposed to be looking for "settings"... you get my drift. IMHO the wonderful flexibility and creativity of the English language is for poetry not UI.
Also, kinda fundamentally: Preferences isn't even under "File" or a settings Icon as it is in every piece of software I have ever used: Global program settings is in the Edit menu.
Affinity really should at least have a flag in Help eg "Settings (previously called Preferences)"