How to get rid of color square pop up?

I have asked a similar question some time back, it doesn’t seem possible. Hopefully you’ll get an asnwer, I’d be interested in this as well.

In the meantime you can check if this plugin has a better behaviour for you. It doesn’t have those patches appearing outside of the docker, only inside and they are permanent so I find them less annoying. You can see it here: Pigment.O plugin