I was also looking for this solution, how to change the font and everything turned out to be very simple, read it here - https://www.xiaomiinfo.ru/kak-izmenit-shrifty-na-smartfonah-xiaomi/
* Deep breath * WORKS ON MIUI 10 AND BELOW Thames, who has no specials. tabs with fonts in themes. We go to the topics. We type mobyfont in the search, pages down, select "show more" above the fonts. Choose a font, load a font, apply a font. Reloading our charm. You can restore the default font simply by applying any theme (completely, not in parts). Ps. On miui 11, fonts are either only on custom firmware, or they will have to be downloaded and installed * AND NOW ON MIUI 11 * 1) download the program to work with MIUI fonts. I took the very first one in the play market - MIUI Custon Font Installer 2) We go into it. There are three stripes in the upper left corner. 3) Looking for the word Russian 4) Choose a font from the ones you like 5) Poke at it. At the bottom Download, poke, then Set, poke too, and finally select the 3 method-Latest. We poke naturally and as calmly as possible, bypassing a ton of ads. Note: you can choose method 2 New and skip the subsequent steps, just restarting. But it worked with errors for me. So you better not. 6) If the topics were not immediately opened, then open them. Click on the man icon (profile) below. And then at the top, select the themes (blue icon). 7) Find our font among the themes. There are two of them alike. We are interested in the one that is cut with (Apply Me) Font name. 8) Apply, reload. Voila. Ps. Only the font is small. But the taste and color.
You need to go to the Themes branded application, select the fonts tab, download and install the fonts you like. If you choose from the installed fonts, go to the branded Themes application, then the account, click on the Fonts button and select the font you like.
It's all about configuring keyboards-
My Xiaomi phone has installed the gboard keyboard update today and got an error that prevents the keyboard from being called up? I can't unlock my phone. Nothing helps, what to do