Hi Đức Kiên Lê,
Since the monitor is actually 60 Hz but Windows is displaying 60,000 Hz, this may be an incorrect display-mode value rather than the monitor actually operating at that refresh rate.
One additional check is to reset how Windows detects the monitor:
- Open Device Manager > Monitors.
- Right-click the Dell monitor and select Uninstall device.
- Restart the PC and let Windows detect the monitor again.
- Check Settings > System > Display > Advanced display afterward.
If it still shows 60,000 Hz while the display otherwise works normally, I recommend reporting the incorrect value through Feedback Hub (Windows + F) as suggested by AI answer.
Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas.
I hope this helps narrow down whether the unusual value is coming from Windows' monitor detection.