When using 'some string' to show as a submenu of a menu page created by a plugin, this item will become the first submenu item, and replace the location of the top-level link. If this isn't desired, the plugin that creates the menu page needs to set the add_action priority for admin_menu to 9 or lower. When using 'some string' to show as a submenu of a menu page created by a plugin, this item will become the first submenu item, and replace the location of the top-level link. If this isn't desired, the plugin that creates the menu page needs to set the add_action priority for admin_menu to 9 or lower.
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