Hi Adi Wijaya,
To permanently disable this feature and lock your display to a stable 120Hz, you should open Windows Settings, navigate to System, and click on Display. From there, select Advanced display, look for the Choose a refresh rate drop-down menu, and explicitly select 120 Hz instead of any option labeled as Dynamic. If your laptop model includes a dedicated hardware toggle for Dynamic Refresh Rate underneath that menu, ensure it is switched to Off, keeping in mind that while this configuration provides a perfectly smooth visual experience, it may slightly increase battery consumption compared to the adaptive mode.
Setting the refresh rate to 120Hz will be smoother but may consume more battery power and some applications/drivers may still cause stuttering if they force a refresh rate; if stuttering persists, updating the BIOS/display drivers and trying to disable power saving features in the BIOS/Windows usually helps.
If these adjustments successfully stop the screen stuttering on your laptop, please accept this answer to assist other users dealing with display transition glitches.
Tracy.