[Xiaomi Mi Note 10 Lite Questions & Answers] ApexPrime:
The theme manager works with xiaomi eu, along with wallpaper carousel and many other features which are disabled by default for miui global users(AFAIK). If it's possible, I would advise you to unlock your bootloader and install xiaomi eu, which is basically the chinese variant of the miui rom, but has been debloated and optimised to a great extent by some developers. There is already a thread regarding its installation but if you need any help or have questions, you can ask me here.

The following text is taken from the xiaomi eu website or specifically from the link: https://xiaomi.eu/community/threads/miui-12-0-stable-release.56191/

Our ROMs features (Whats not in Global):

Based on China Stable / Weekly builds (except POCOF1, HMNote6Pro, HMNote8T, HMNote9ProMax, HMNote9Pro_HMNote9S, HMNote9ProEU)

Enabled search gesture (swipe up) on the desktop

3way reboot menu (in dev settings)

Dark Mode (Night Mode) for all devices (In the dev settings except 9.x/10.x)

Removed ads in MIUI system apps

Face Unlock for all devices

Vertical clock widget on lockscreen

Steps counter in Assistant screen

More shortcuts on left lockscreen

Wake up gestures

AI preloading option in MIUI Lab

Fullscreen gestures

Option to auto-expand first notification

Notifications priority settings

More edit options in Gallery app

Enabled MiDrive in File Explorer

Added landscape mode for SMS app

Sunrise/Sunset in the weather app

Google apps support integrated

Removed 5GHz region restrictions

Confirm dials from call logs

Morning report on alarm at morning

More apps supported for AOD notifications

More styles for AOD screen

Raise to wake gesture

AOD notification received animation

Default volume control stream toggle

Tap fingerprint sensor to wake toggle

More Camera features

Double tap to lock screen

Battery AI scenes

Allowed disabling specific system apps

Importing theme .mtz from zhuti.xiaomi.com via ThemeManager

No useless Chinese bloatware apps

More free RAM due to less background processes

Unified flat style app icons for both system and 3rd party apps

Advanced menu with color icons

No any Chinese character under the full system

Mi Video, Mi Music, Mi Browser: No any useless Chinese content

No possibility to re-lock bootloader accidentally with flash any xiaomi.eu release

Added real 27 languages translation made by Official MIUI Fansites and MIUI Fans

Added EU T9 dialer support

Added charging sound switch

Added Screen-OFF animation

Optimized GPS settings for EU

Optimized Battery consumption

Optimized RAM consumption

Added 3D Touch to MI5S 3GB RAM version

Added GSMalphabet into SMS app options

Added more icons grid layout 4x5, 4x6, 4x7, 5x5, 5x6, 5x7 (depends on device)

SafetyNet passed (Google Pay)

Play Store Certified

Deodexed

Added automated tasks in Security app

Added game speed booster

Added erase module (magic elimination) to Gallery photo edit options

Fixed low volume sound via headphone

Charging screen

And more, and more made by our 9 years MIUI mods experience

---------- Post added at 02:31 PM ---------- Previous post was at 02:16 PM ----------

https://xdaforums.com/mi-note-10-lite/how-to/flash-custom-rom-xiaomi-eu-install-t4131921

This is the thread which has the instructions and required files to install xiaomi eu. If you really are interested, you should read all the comments in the thread to get a general idea of how the installation is carried out.