Stacking buttons CP 12.3?

Mini Mac, Sonoma 14.6.1, CP 12.3.

I have just completed several projects in CP Classic 2019 and I am now looking at CP 12.3. As a learning exercise, I have been working through the CP 12.3 UI to try and understand how one of my previous projects from CPC 2019 can be created exactly the same in CP 12.3.

In my CP classic projects I have used a stack of UI buttons, each has an EAA script that performs an action and then reveals the next button in the stack etc etc.

From what I can see, (I don't find the CP12.3 User Guide that intuitive) buttons in CP 12.3 cannot be stacked? Is this correct or am I missing something. I can only assume that as CP12.3 is fully responsive, using fluid boxes that stacking buttons cannot be done. I this correct and does anyone have a " work-around" for this please

BobG.