Hello... "The ROG SWIFT features a dedicated hotkey to toggle refresh rate on-the-fly without needing to access the graphic driver control panel. Quickly select from 60, 120, or 144Hz refresh rates and go back to gaming." https://www.asus.com/us/Monitors/ROG_SWIFT_PG278Q/
Nice monitor B )
You have possible Monitor/Graphic driver VSYNC settings of 60, 120, 144 You can experiment with the different games and the Video card you are using... Sometimes it helps smooth out the game play. Typically I can enable VSYNC in the Graphic Driver APP or in the Game settings it self.