Customize Query for post

The hierarchical argument when registering a custom post type should be set to false which is also the default setting

hierarchical(boolean) (optional)

Whether the post type is hierarchical (e.g. page). Allows Parent to be specified. The ‘supports’ parameter should contain ‘page-attributes’ to show the parent select box on the editor page.Default: false

Note: this parameter was planned for Pages. Be careful, when choosing it for your custom post type – if you are planning to have many entries (say – over 100), you will run into memory issue. With this parameter set to true WordPress will fetch all entries of that particular post type, together with all meta data, on each administration page load for your post type.

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