Just a suggestion for those of us who are a little colour blind :) (This isn't just CA4, I have this problem with CTA3 too)

Some icons like the 'Lock/Unlock Ratio' icon shows active in red and not active in black....which for someone who is colour blind, it's very hard to see because the icon is so small....maybe try something like the image attached?

I'm sure there are a few other icons which this could apply to but this is the one I run into issues with all the time.
Cheers