In show all posts I have changed the number of items pe page from 20 to 500 and after that I got a timeout as it could not display all the posts. And now every time I go to show all posts I get a white blank page and no posts and I am not able to change the number of items to be displayed on the page.

  • Turn on WP_Debug and look for errors. – Robert hue Jun 29 '15 at 3:28

Install and activate User Meta Manager plugin. Go to Users -> User Meta Manager. Under your user click on Edit Meta. From pull down list of meta keys select edit_post_per_page and click Submit. Change the value to 10 and click on Update. All done.

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