This blogpost collects all the tips around the columns in the admin interface. Each post is one row, so each column is a field about a post.

The free wordpress.com gives me zero customization.

— the wordCount scratches a big itch

— I added a Pub column for publicationDate. It is unsortable, but much shorter (space-saving).
I unhide the original Date column (too wide) when I need to sort by date.

On the post listing page there are two controls: 1) AdminCol config and 2) ScreenOption complement each other .

— by downsizing the Other columns, I leave more room for title. Relieves the pain of “too many posts with unclear title, forcing me to open each to read”
Note category/tag only offer limited relief.