Remove Bulk Actions Dropdown

To remove the bulk actions dropdown menu, you simply need to remove all actions! Just hook in and replace the default actions array with an empty array.

add_filter( 'bulk_actions-' . 'edit-post', '__return_empty_array' );

In this case, only the bulk actions menu on the All Posts page will be removed. To use elsewhere, replace ‘edit-post’ with the screen ID.