Various Icon sizes:
This is how the icons will look in a button menu set to 65 (small device):
Pretty much as I expected, except pixel size 128, what happen?
Notice how the button images sit in the button box.
Here’s the same button menu with Button background color set to “clear”. (Please note clear is not the same as empty.)
Please note, “Transparency” is not about making the “Button Box” disappear.
I didn’t enter a value in the Transparency box to make these changes.