Bug with plugin "Screen Customization" ?

Hello,

I'm testing on a "test environnement" the 9.0.4 version and have an issue with the plugin "Screen Customization - version 5.3".

On the production environnement (8.6.5 withe the same plugin), I've created on some element (Project, Activity) some new fields. A few fields have "choice list" and all works fine.

On the test environnement, all works fine but I can't modify (or create) news "choice list" with the plugin : the icon to do this is missing

On the 8.6.5 environnement with screen customization 5.3

On the 9.0.4 environnement withe the same plugin

Is it a bug or is there a new way to do this ?

Thnaks for your help

Damien