Does anyone know how to change the size of icons in the ribbon of Creo 4.0?
I'm don't think you can change the actual icon sizes but you can hide the command labels.
How to hide them:
This might be worth reading as well:
Icon in Creo cannot resize. When resizing the Creo Window group/icon can collapse as it works on group policy to decide which group needs to collapse first.
Contrary to what @TomU and @MaheshSh said, you can resize icons (you can switch between large and small version of the icon). To change the size of the icon, first right-click the ribbon and select Customize the Ribbon to display Creo Parametric Options dialog box. Then you can simply right-click desired icon and select Small Button or Large Button to set the icon size.
For example, all icons set to Small Button:
And all icons set to Large Button:
This is great to know! However, small buttons seem to be the default option as well. I'd like and option to go "smaller" than the default option.