photoshop problems

am trying to apply the Cutout filter to an image. The preview and actual image show no change. In fact, after playing around with it, none of the Filter Gallery filters work. I am in 8-bit using Photoshop CC (latest version 2019). I've tried resetting my preferences and no clue why this isn't working.

I also tried with other images of differing sizes, colors and resolutions. Still no change.