Applications uses 'UserDefaults' To store data such as configuration and user information, it's also called (NS)UserDefaults. It's stored as plist inside the application data folder (/Data/Application/{BUNDLE-ID}/Library/Preferences/).

We can view the plist file with the content by going to the dir above or we can view the UserDefault settings via objection:

iron@MacOS Payload-signed % objection -g "DVIA-v2" explore
Using USB device `iPhone`
Agent injected and responds ok!

     _   _         _   _
 ___| |_|_|___ ___| |_|_|___ ___
| . | . | | -_|  _|  _| | . |   |
|___|___| |___|___|_| |_|___|_|_|
      |___|(object)inject(ion) v1.11.0

     Runtime Mobile Exploration
        by: @leonjza from @sensepost

[tab] for command suggestions
* on (iPhone: 14.6) [usb] # ios nsuserdefaults get
{
    AKLastEmailListRequestDateKey = "2021-06-16 10:13:44 +0000";
    AKLastIDMSEnvironment = 0;
    AddingEmojiKeybordHandled = 1;
    AppleITunesStoreItemKinds =     (
        "itunes-u",
        movie,
        album,
        ringtone,
        "software-update",
        booklet,
        tone,
        "music-video",
        "tv-episode",
        "tv-season",
        song,
        podcast,
        software,
        audiobook,
        "podcast-episode",
        wemix,
        eBook,
        mix,
        artist,
        document
    );
    AppleLanguages =     (
        "en-GB"
    );
    AppleLanguagesDidMigrate = 18F72;
    AppleLanguagesSchemaVersion = 2000;
    AppleLocale = "en_GB";
    ApplePasscodeKeyboards =     (
        "en_GB@sw=QWERTY;hw=Automatic",
        "emoji@sw=Emoji"
    );
    INNextFreshmintRefreshDateKey = "645617603.467853";
    INNextHearbeatDate = "645973764.728657";
    NSInterfaceStyle = macintosh;
    NSLanguages =     (
        "en-GB",
        en
    );
    PKKeychainVersionKey = 8;
    PKLogNotificationServiceResponsesKey = 0;
    "com.apple.content-rating.AppRating" = 1000;
    "com.apple.content-rating.ExplicitBooksAllowed" = 1;
    "com.apple.content-rating.ExplicitMusicPodcastsAllowed" = 1;
    "com.apple.content-rating.MovieRating" = 1000;
    "com.apple.content-rating.TVShowRating" = 1000;
}
* on (iPhone: 14.6) [usb] # env

Name               Path
-----------------  -------------------------------------------------------------------------------------------
BundlePath         /private/var/containers/Bundle/Application/3A52DA3E-3998-4DEC-9DB0-69585AA8DC44/DVIA-v2.app
CachesDirectory    /var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Library/Caches
DocumentDirectory  /var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Documents
LibraryDirectory   /var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Library
* on (iPhone: 14.6) [usb] # cd /var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Library
/var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Library
* on (iPhone: 14.6) [usb] # ls
NSFileType      Perms  NSFileProtection    Read    Write    Owner         Group         Size     Creation                   Name
------------  -------  ------------------  ------  -------  ------------  ------------  -------  -------------------------  -----------------------
Directory         493  n/a                 True    True     mobile (501)  mobile (501)  128.0 B  2021-06-16 13:56:28 +0000  Caches
Directory         493  n/a                 True    True     mobile (501)  mobile (501)  64.0 B   2021-06-16 13:57:45 +0000  FlurryFiles
Directory         493  n/a                 True    True     mobile (501)  mobile (501)  96.0 B   2021-06-16 13:57:45 +0000  Saved Application State
Directory         493  n/a                 True    True     mobile (501)  mobile (501)  64.0 B   2021-06-16 13:56:28 +0000  Preferences
Directory         493  n/a                 True    True     mobile (501)  mobile (501)  96.0 B   2021-06-16 13:57:45 +0000  Application Support

Readable: True  Writable: True
* on (iPhone: 14.6) [usb] # cd Preferences
/var/mobile/Containers/Data/Application/03B7F74C-3CEF-4FB5-9712-3143A9B44FDA/Library/Preferences
* on (iPhone: 14.6) [usb] # ls
NSFileType    Perms    NSFileProtection    Read    Write    Owner    Group    Size    Creation    Name
------------  -------  ------------------  ------  -------  -------  -------  ------  ----------  ------

Readable: True  Writable: True