Hi Li Song,

'Latest' is referring to the author, so latest author would be the newest author that signs up on the site. 'Latest post' orders the author by checking who created the latest post on the site.

Can I configure the sorting options from back end?

You can configure the default ordering in the backend(http://take.ms/aYlW6).

But why the attached example is in wrong order?

I figured out now. No worries.

How to delete the options in the drop-down list for sorting? Can I do it in backend configurations?

Hey Song,

Glad to know you figured out the ordering.

For the options in the sorting dropdown list, there are no settings to remove them.

If you want, you would have to template override the following theme file: http://take.ms/gTipg
JoomlaFolder/components/com_easyblog/themes/wireframe/authors/default.php