In this version, the managing of posts by author is no longer under the Manage Posts section. That’d be too obvious, I guess.
Go into your dashboard and then look at the far right of the screen, you know, where Settings, Plugins, Users are located (the stuff that is supposed to be little used).
Click on Users. Then you’ll see all of your users listed. At the end of each user’s record (row), you’ll see their number of posts. Click the number and it will filter their posts and redirect you back to, you guessed it, the Management section.
You can still filter by author. You just can’t get to those posts directly from the Manage Menu, you have to go through the User’s menu first and get redirected back to the Manage Posts section.
How’s that for efficient? ??