P: Impossible to set cache levels to 1
Recently I have come across a post regarding color differences between layered and exported files here
https://community.adobe.com/t5/photoshop/problem-with-curvers/m-p/11036512?page=1
but it turned out, once again, to apparently be about the preview of Adjustment Layers on noisy images at magnifications other than View > 100%.
I seem to recall that setting the Cache Levels to 1 could be used to address this issue (at a cost naturally).
And according to this page
https://helpx.adobe.com/photoshop/kb/optimize-photoshop-cc-performance.html
it should be possible, but when I set the Cache Levels to 1 they revert to 2 at restarting Photoshop. (Photoshop 21.1.1 on macOS 10.15.3)
What could I be overlooking?
Thanks in advance and have a good weekend!

