Direct link to the study: https://www.psycnet.org/doi/10.1037/ppm0000672

Unfortunately, its paywalled, but I’d be curious about the methodology and population.

No luck. Notably, the button they say this should enable is already present, it just doesn’t do anything.

Looks like it’s included in kubuntu-settings-desktop. I think it got uninstalled when I removed the how-to videos, since that seems to be the same package.