In message , Roland Perry
writes
In message , at 09:11:47 on
Wed, 29 Apr 2020, Tim Lamb remarked:

You right-click on the newsgoup name, which brings up a menu
including "Properties",

Ah! Missed the bit above. Thanks.

I'm assuming you just want to mask cross-posts to one particular group,
not all crossposts across your entire set of subscribed newsgroups.

Huh! Nobody posts to my other groups! Pity to lose some of the American
contributions but their main interest seems to be cars.

--
Tim Lamb