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Hi Julien, I have the same issue, the solution I found is put this in top level pages.

'parent' => 0

Using your example code:

public function my_settings( $settings_pages ) {

      // Top level
      $settings_pages[] = array(
          'id'              => 'my-settings-id',
          'option_name'     => 'My Settings',
          'menu_title'      => 'Settings',
          'icon_url'        => 'dashicons-admin-settings',
          'submenu_title'   => 'Général',
          'parent'          => 0,
          'style'           => 'no-boxes',
          'columns'         => 1,
          'position'        => 80,
      );

      return $settings_pages;

    }