Turn off Web Album Art - setting appears to be ignored, art is still displayed

Volumio Version: 2.853
Hardware: RPi3B
DAC: HiFiBerry DAC Plus

I have Sources > Web Album Art: off & saved.
I clicked the Reset Album Art Cache button.
Still when I browse tracks, the album art is slowly being updated from some internet source. I am trying minimize internet traffic. Past experience suggests the album art also slows down the tablet Volumio app. I don’t recall in my previous Volumio version 2.779 this being an issue.

Thanks for any tips.