Sorry I must say I’m very dissapointed with your launcher. I waited a long time for passcode, no use, when finally installed from Play Store its readability is awfull, the font size is so small my eyes hurt and I can’t enlarge font size on Mi 9T phone. Half of the options don’t work as seen on video tutorial.
I must apologize for this.
I had a problem with dark mode per app which was ON in Mui12. Turning dark mode to OFF font looks great and lemon colour is here, radio buttons.
So I suggest you put this in manual, Miui 12 dark mode must be OFF for this app, at the same time overall/system dark mode is ON.