Portrait mode is working. Just like pixel 2
I'm on Redmi note 4(mido)
Tested on nougat and oreo too.
I tried this app and it's working.
I'm not the developer. All credit goes to Arnova8g2.
I hope it helped you. Hit like if u do.
It's good ROM frequently updates. It's better if you add delta update like omini rom
Good rom. But still no where near RR nougat.
As viper4android fx and other sound mod does not work (now working magisk module)on oreo. I found a this app which works on mido oreo( any version)
I'm not a developer. Try if you want
Flash through twrp
This is exactly where you ask questions.
Now it's moved to questions.
Before he asked at roms and kernel development field.