Toggling the Resolution in Viewport panel on the Render settings is only for display in the viewport, right? This is not supersampling when we capture an image/video? In order to capture at higher resolution, we must increase the resolution in the Capture Settings (Ctrl+P menu)?
Edit : I realized how easy this is to actually test. I set viewport res to 1/2 and rendered image looks same as at 2x so, I think that answers the question.
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To increase supersampling, increase the samples setting in capture settings.