Correct me if missed the setting for this topic. I do save my processed feature codes on my main project. Some projects could more then other and will have Pre and Post topo's of the project. I am sure a lot of us after processing the points and getting the data we need we don't look at that layer any more. So after trying to hide some layers that I use once or abit more, I am unable to hide layer i choose not to see.
I have click on the advanced view filter setting and it will hide all my used layers. I keep all my topos at the bottom of my layer list, it is just overwhelming at time seeing so many layers. I even place empty layers between useable layers. This will be good on copied filters.