The command to change this setting for you is
Sharper: /console set ResampleAlwaysSharpen 1
^ only works with FidelityFX setting as Resample Quality, and a low number for "resample sharpness"
Default: /console set ResampleAlwaysSharpen 0
Here's the reddit post: / a_comparison_between_render_scale_settings
And Naowh's tweet: / 1600924832350494720
Check out my stream at / dratnos