WP Profile: Change the WordPress Language | Admin Language and Toolbar

Changing the WordPress language works in two ways: switch the whole site with the Site Language in Settings, or change only your own account's admin screens with the Language in your user profile. To capture the admin screens in both Korean and English, I left the site language in Korean, changed only the admin account's profile language to English, and ran the visitor-facing site and the admin screens in different languages.
1️⃣ Site language and admin screen language
If you change the site language first just to see the admin screens in English, the strings of themes and plugins that have translation files change on the visitor-facing site as well. In the simulator below, switching [Language] in [Users › Profile] to English turns only the admin screens English, while the site stays in Korean.
프로필 업데이트 됨.
설정이 저장되었습니다.
The real screen is the same. On a test site, after changing the admin account's language to English (United States) and opening [Settings › General], the admin screens appear in English while [Site Language] stays Korean. Even when you open the site while logged in, the toolbar at the top appears in Korean, the site language.
2️⃣ Change the admin screen language in Users › Profile
In [Users › Profile], choose [Language] under [Personal Options] and click [Update Profile] at the very bottom of the screen to apply it to that account's admin screens. Choosing [Site Default] at the top of the list follows the site language, and other users' admin screens are not affected.
The list shows the languages installed on the site, and admins with permission to install translations also see the languages they can install. On an account where English is the only installed language and there is no permission to install, the [Language] field does not appear at all.
3️⃣ Hide the toolbar (admin bar)
The toolbar, which only logged-in users see, disappears from the site view when you uncheck [Show Toolbar when viewing site] in the simulator's [Users › Profile] and click [Update Profile]; in the admin screens it is always shown regardless of this setting.
This checkbox is saved separately for each account, so on a site that accepts registrations, hiding the toolbar for all users at once means adding the single line [add_filter(‘show_admin_bar’, ‘__return_false’);] to your theme's [functions.php] or a code snippets plugin. This filter also applies only to the site view and does not affect the admin screens.
4️⃣ Administration color scheme
The color scheme is a per-account setting that changes the colors of the menu and buttons on the left of the admin screens, and WordPress 7.1.3 ships with nine: Default, Fresh, Light, Blue, Coffee, Ectoplasm, Midnight, Ocean and Sunrise. As in the simulator, it is applied the moment you pick it and saved right away, so you don't need to click [Update Profile].
If you manage several sites, picking a different color for the admin account on each site lets you tell at a glance which site's admin screens you are in. The design visitors see on the site does not change.
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