In my case, after updating, the “Default Target Attribute” setting disappears, and even if I set it again, only Content is printed. How can this be normal?
Warning: Cannot modify header information – headers already sent by (output started at /home/△△△/●●●.com/public_html/index.html:120) in /home/△△△/●●●.com/public_html/wordpress/wp-content/plugins/multi-device-switcher/multi-device-switcher.php on line 136
を記述して120行目でWP Queryで新着投稿一覧を出力しようとしていて、上記のWarningが出力されます。
スマホ用閲覧ページ(https://●●●.com/sp/index.html)にも同様に新着投稿一覧を出力しようして、multi-device-switcher.php on line 133で同じ内容のWarningが出力されます。