stuck at 60hz refresh rate on Low brightness

Please tell us some basic information before asking for help:

1. Model Name: rog phone 3
2. Firmware Version: tencent edition
3. Rooted or not: not
4. Frequency of Occurrence:
5. APP Name & APP Version (If your issue relates to the app):

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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Why is the refresh rate stuck at 60hz on low brightness?

i can't use 120hz or 90hz at night