Please tell us some basic information before asking for help:
Model Name: ROG Phone 5 ZS673KS
Firmware Version: WW-18.0840.2112.210
Rooted or not: No
Frequency of Occurrence: 99%
APP Name & APP Version (If your issue relates to the app): FF7 first soldier, LOL: Wild Rift, Fortnite, and others
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.
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With Kunai 3 connected (hand held mode) games have green boarder around them, like a window boarder screen