I think that lots of forum members bookmark a page of this forum - e.g. I bookmarked the one about my phone (Nokia 8).
When they have a problem they do not know where to look on the forum of their phone because there is no search box. They only see 'New Discussion'. So they are expected to first go to the Home page: https://community.phones.nokia.com/
My solution would be to insert a search box widget in the right hand side column just above the 'New Discussion'-button.