I bought this phone after selling my note 9, buying this and having some spare cash. Similar internals and it's a lovely phone.
I like to mess with my phones, with themes and launchers etc. So I use nova launcher. You can't get themes for these as it says " not for my region". It's a global version, so I've now figured out you can just change your region to India, and Bob's your uncle, you can change and download themes through the mi app.
Once you've got your theme, change your region back. Hope this helps as it took me a day to discover this.
Also, if you change your region to India, you can use face unlock too! Time and date stay the same. Just go into settings, type in region, find India, select it, and boom, face Id is in the security section.