This is the default Boot Animation for all AROMA ROMs and it cannot be changed during the installation.
If you want to revert to the default boot animation, you can search for the corresponding bootanimation.zip, download it to your phoneand place it into /system/media folder replacing the old one.
You got to have root privileges to do this using a root enabled file explorer like Root Explorer.
Thanks for your answer
One more thing....
Is it possible to add china rom features on global rom like 1.automated tasks,
2.search assistant,
3.steps counter,
4.mi music with multiple format support
@Narashimman
We will add some modds in XTRV but not right away , we need time now to prepare all roms for miui 10 and as soon as will be ready then we will add more things in roms ..
Thanks !!
Edit
Bootanimation can be changed to XTRV ARΩΜΑ bootanimation or to XTRV default bootanimation , not exactly to stock miui bootanimation...
Maybe will add an extra option for mi bootanimation in feature releases..