That's maybe for global rom. When using chinese rom, I used DSDA without any settings and There were option for turn on/off "dual active mode" in developer settings.
I tried "setprop persist.radio.multisim.config dsda" with adb su shell. but not working
https://android.googlesource.com/platform/frameworks/base/+/5e02fa9/telephony/java/com/android/internal/telephony/TelephonyProperties.java
Redmi K60 Pro supports DSDA(Dual sim Dual active, ex)both can calling sim1 and using data sim2) in China rom,
But not working in this EU rom(Stable, 14.0.17.0)