All authors page: Set post length

Hi,

I am using EasyBlog to embed a Blog page within my website.
I would like the Blog Page to be an All Authors EasyBlog menu type, where, however, the posts should have a certain length, rather than having the listing of the different authors's posts, so that for each post I can show three/four lines and one picture/video.
How can I achieve that? I tried to modify truncation properties, but it doesn't seem to apply...


Thanks in advance,
Valeria