If you have a G-Sync monitor and G-Sync capable graphics card, you’ll need to do a bit of setup to get it all working. After hooking everything up, open the NVIDIA Control Panel on your PC by right-clicking your Windows desktop and selecting “NVIDIA Control Panel”, or launching the “NVIDIA Control Panel” application from your Start menu.
Head to Display > Set up G-SYNC. Ensure the “Enable G-SYNC” option is checked. By default, G-Sync is only enabled for games running in full screen mode. You’ll probably want to select the “Enable G-Sync for windowed and full screen mode” option instead. This will make G-Sync work even when you play games in windowed mode on your desktop, too. Click “Apply” after you change any options here.
If you have multiple monitors connected to your PC and only one of them supports G-Sync, the control panel will guide you through setting the G-Sync monitor as your primary display first.