Sorry if his is in wrong place.
I changed base url to /forum/ in Setting without touching slug in the page itself as you suggest: However - now I can access the page via /forum/ AND /community/ - is this normal? Won't this create duplicate content?
Also - every time I add the 'forum' page in widgets to the main site menu it still has /community/ slug. Is that right?
What am I doing wrong?
How have you changed the URL? Have you also changed the page slug of the forum? Just edit the forum page and check the page slug. It recommended being the same. Also please make sure you have one forum page and there are no other pages with [wpforo] shortcode.
So in fact I DO need to go and edit the page slug itself so the /base/ and /page slug/ match?
yes, please try it.