"Search completion" setting is not changed. (Wikipedia:バグの報告#ログイン時のみ右上の検索ボックスのサジェストがおかしい、また個人設定の「検索の補完」が変更不能 - jawiki)
Using Firefox 98.0.2 and Chrome 99.0.4844.84/Windows 10 and Google Chrome 99.0.4844.74/macOS Big Sur ver. 11.6.4
Steps to reproduce:
- Access https://ja.wikipedia.org/wiki/Special:Preferences
- "Search completion" Change settings and save.
- Message for "Your preferences have been saved." However, it is unchanged from the default.
Same result with enwiki ( https://en.wikipedia.org/wiki/Special:Preferences ).