様々試行錯誤をした結果、Explorerのドキュメント、ダウンロード、デスクトップのプロパティ→場所→標準に戻す→適用で、3フォルダのありかをDropboxのフォルダからC:\\Users\\●●●●(私の名前)\\Documentsに戻せることがわかり、実行しました。その結果、My PCとの同期が起きない、PC本体の制御下に戻せました。操作の方法は異なりますが、以下の記事も参考にしました。
https://faq.nec-lavie.jp/qasearch/1007/app/servlet/relatedqa?QID=020508
私の場合はDropboxをアンインストールした後、この操作をしたので戻せたのかもしれませんが、もしインストールしたままでもこの操作が有効なのであれば、これが当面の解決策になるのかもしれません。正解かどうかわかりませんが、参考にしていただければ幸いです。
また、そもそも、Dropboxインストール時、デフォルトでMy PCのフォルダがExplorerにできてしまうのは改善してもらいたいものです。PC本体、Dropboxにファイルを分けて保存したい利用者には困りものです。仮にDropboxの有償版に誘導するための仕組みだとしても、利用者に混乱と不便を強いるやり方なので逆効果です。販促の方法としては間違っているのではないでしょうか。
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