You are using komento on easyblog i presume, please advice?
If you are, to set this please go to backend > komento > integrations > easyblog > layout > frontpage
screenshot --> http://screencast.com/t/yNhU8GA4EI
and in the entry view is in
backend > komento > integrations > easyblog > layout > general layout
and set according to your preference.
screenshot --> http://screencast.com/t/Me3QnGNI
Unfortunately in Komento there is no truncation for the comments in the main blog entry view. The truncation only applies in the listing page.
Screenshot --> http://screencast.com/t/ys9rba8h