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What? It really couldn't be simpler: You open settings -> screensaver, choose blank after N minutes and close the settings window. Works.

I have no screensaver options under settings: https://i.imgur.com/WM3xIWL.png

Note, I'm using Debian Sid. Gnome 3.36.2 on Wayland.

Try looking under Power.

Nope, this is quite the opposite of black: https://i.imgur.com/L0O0fNn.png

It also turns my display off, which is not what I want: https://i.imgur.com/z5BIqGj.png

Seems like it's not as simple as @nxbp claims.