The Avalon 6 dll is upgrade friendly. But the Custom Code Editor is only minor-version upgrade friendly.
There was a .xml with styles in the Client folder, but that did nothing.
I had to use a Hex Editor to modify the xaml inside the dll and rebuild it. It was merely a .resource file being modified, easy to replicate. But its compiled for 10.2.700 so you would have to patch 2021.1, 2021.2 etc all seperately.
If you are on 10.2.700 for now, let me know in pm I can send you the 2 dll’s to replace in your “client folder”. But I don’t plan to build this or maintain this.
We can make an Epicor Idea for it, the change took me 15 minutes with Hex Editing, it will take Epicor 2 minutes to do it… but 3yrs to get it approved. 