Please tell us some basic information before asking for help:
Model Name: Rog Phone 3/Twinview Dock 3
Firmware Version: Latest
Rooted or not: No
Frequency of Occurrence: NA
APP Name & APP Version (If your issue relates to the app): NA
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
Also even if it is already known, Twinview's screen also suffers from banding/black crush.