I will copy me reply from this other topic:
The “Save” icon changed to lime green is a huge mistake. Now it looks very close to the “File open” icon on the left side.
The “Pan” icon is way too large in Rhino 9 WIP, hence it grabs more attention that most of the more important icons that surround it.
Also, Rhino 7’s “Print” icon was 3d-like and much more recognizable than the flat looking and difficult to distinguish “Print” icon in Rhino 9 WIP.