At what magnification are you viewing the exported images?
At magnifications higher than 100%, quality will degrade, even if smoothing is applied. The image only has so many pixels, and viewing beyond 100% means that the application will have to invent the missing pixels (interpolation), and it never looks good.
If you have a 100 x 100 pixel image, it contains 10,000 pixels.
When you view the image at 400%, the application will display 400 x 400 pixels, which is 160,000 pixels, but the image only has 10,000. So 150,000 pixels (93% of the displayed pixels) have to be invented , resulting in pixelation and low quality.
So you can't zoom in beyond 100% and expect to retain quality.
In general, there is no need to view images at more than 100%, except when editing small details.
The only other exception is if you're using a 4k or higher resolution monitor (which you are not, according to the system info). High resolution monitors have so small pixels that it's necessary to use 200% view to assess image quality.
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