Well that was a steep learning curve investigating G-Sync with the frustration that it just was not the same as your screenshot.
I have found that you need to have the latest Nvidea driver for the RTX 3080 card and on a LG Monitor straight out of the box you need to fiddle around with a complicated little joystick under the monitor to find settings and enable the equivalent FreeSync option and then it still did not show as I was using a HDMI cable and then found out on YouTube you need to use Displayport all of which needs rebooting once you change settings.
At last it displays and I can now see 100 Hz instead of the 60 Hz I was getting before.
As for trying it out in FlightSim I can’t because even before I changed any settings I was getting not a CTD but a complete Switch off , black monitor and Restart on my Gaming PC.
I suspect the very expensive RTX 3080 is faulty as it does the same on GPU benchmark testing so got to get that sorted.
Thanks Again.
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Yeah sorry probably should of mentioned you’d need to toggle it on your monitor menu, and the displayport cable issue slipped my mind too. Glad you got it sorted 
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