A couple recommendations:

[Performance] Disable transition animation scales, improving device performance by reducing animation overhead.

adb shell settings put global transition_animation_scale 0

[Security] Disable 2G connectivity, protecting the device against Stingrays aka IMSI Catchers.

adb shell settings put global preferred_network_mode 9

The preferred_network_mode table (source):

private static final String[] PREFERRED_NETWORK_LABELS = {
        "GSM/WCDMA preferred",
        "GSM only",
        "WCDMA only",
        "GSM/WCDMA auto (PRL)",
        "CDMA/EvDo auto (PRL)",
        "CDMA only",
        "EvDo only",
        "CDMA/EvDo/GSM/WCDMA (PRL)",
        "CDMA + LTE/EvDo (PRL)",
        "GSM/WCDMA/LTE (PRL)",
        "LTE/CDMA/EvDo/GSM/WCDMA (PRL)",
        "LTE only",
        "LTE/WCDMA",
        "TDSCDMA only",
        "TDSCDMA/WCDMA",
        "LTE/TDSCDMA",
        "TDSCDMA/GSM",
        "LTE/TDSCDMA/GSM",
        "TDSCDMA/GSM/WCDMA",
        "LTE/TDSCDMA/WCDMA",
        "LTE/TDSCDMA/GSM/WCDMA",
        "TDSCDMA/CDMA/EvDo/GSM/WCDMA ",
        "LTE/TDSCDMA/CDMA/EvDo/GSM/WCDMA",
        "NR only",
        "NR/LTE",
        "NR/LTE/CDMA/EvDo",
        "NR/LTE/GSM/WCDMA",
        "NR/LTE/CDMA/EvDo/GSM/WCDMA",
        "NR/LTE/WCDMA",
        "NR/LTE/TDSCDMA",
        "NR/LTE/TDSCDMA/GSM",
        "NR/LTE/TDSCDMA/WCDMA",
        "NR/LTE/TDSCDMA/GSM/WCDMA",
        "NR/LTE/TDSCDMA/CDMA/EvDo/GSM/WCDMA",
        "Unknown"
};

By setting the preferred network mode to a value that excludes 2G (GSM) networks, you effectively disable 2G communications.

• GSM = 2G
• WCDMA, CDMA, EvDo = 3G
• TDSCDMA = Chinese 3G
• LTE = 4G
• NR = 5G NR

[Privacy] Enable Private DNS with AdGuard:

adb shell settings put global private_dns_mode hostname
adb shell settings put global private_dns_specifier dns.adguard-dns.com

Using private DNS allows DNS queries to be sent in a non-vulnerable-to-espionage way to the DNS resolver. Using the AdGuard servers, also enables users to block ads.

Warning: I have not tested these commands.

Android 12: Getting the old WiFi toggle back under Quick Settings

Since Android 12, the WiFi quick toggle button has been changed. A tap no longer activates or deactivates the WiFi interface; instead, a selection of different network connections is displayed. Only setting the slider changes the connectivity - but it can be adjusted via ADB:

adb shell 'settings put global settings_provider_model false'
adb shell 'settings put secure sysui_qs_tiles "wifi,cell,$(settings get secure sysui_qs_tiles)"'

Reversion code:

adb shell 'settings put global settings_provider_model true'
adb shell 'settings put secure sysui_qs_tiles "internet,$(settings get secure sysui_qs_tiles)"'

Translated with DeepL.com (free version) from https://www.kuketz-blog.de/android-12-alten-wifi-toggle-unter-quick-settings-wiederbekommen/