Switching to UK Spellings and Usage

In the past I was able to choose UK spellings and usage in Scrivener, but I can’t figure out how to do it now. Even instructions I found by googling didn’t seem to work any more.

I’m changed my Mac’s system preferences to UK and also my MS Word, but Scrivener is still showing American spellings. Help, please? Thanks!

You should only need to change the language, not the region.

briarkitesme.com/2014/11/17/chan … scrivener/