If you have been testing the latest development version of WordPress in the past week or so, you may have noticed that the ability to drag and drop meta boxes seemingly disappeared. This is not a bug. Nine days ago, lead developer Andrew Ozz committed a change that requires end-users to click the “screen options” tab to expose the ability to rearrange meta boxes.
Ozz opened the original ticket and has spearheaded the effort to change how users interact with meta boxes. The issue he would like to solve stems from a change in WordPress 5.5. WordPress’s last major release