Note most of the applets in the tray do not have a BeautyLine icon, so they are just using whatever icon is available instead. I pinned an app that does have a BeautyLine icon (last one on the right in the dock) and as you can see it is using the correct icon.
As it stands now I don’t think there are any icon packs that support cosmic app icons. I did a bit of a search the past two days an came up short.
Make sure you also have them in a .icons folder in your main home folder so /home/$USER/.icons/... also having gnome-tweaks helps for there apps that don’t respect changes. maybe a fix will be added to cosmic-tweaks but lets hope they do something better then that.
You’re probably forgiven, I had to boot up Cosmic today to confirm that both panel and dock could be autohide (thought so…but you know). We can’t remember everything, despite our advanced age and individual wisdom rofl.
I knew that you could set the panel and dock to the background. What I didn’t know was how to replace the icons with more attractive ones (matching my color scheme and background image).
Thank you for your reply.