Thank you all for your advice.
On my PC, the resolution that could be selected on the desktop was 2293x960, so I tested with this resolution.
Case1:
desktop:3440x1440, NVCP:Image Scaling is off
MSFS:3440x1440,TAA,FullScreen
Case2:
Desktop:2293x960, NVCP:Image Scaling is on
MSFS:3440x1440,DLSS,FullScreen
Case3:
Desktop:3440x1440, NVCP:Image Scaling is on
MSFS:3440x1440,DLSS,FullScreen
However, there was not much change between Case2 and Case3.
I think PMDG737 is forgivable once you get used to it.
However, I find it difficult to get used to the G1000 as it makes me feel as if my eyes are much worse.
Also, it is inconvenient to set the desktop resolution to 2293x960, so I decided to stick with Case3 in my case.
