Visible length is shorter than icon length. Operation not performed

What causes this issue?

You are editing an element (output field or pushbutton) to which an
icon is assigned and want to reduce the visible (visualized) length.
The value you have entered as visible length is shorter than the
minimum length of an icon which is 2.

System Response

The system accepts only visible lengths that have at least enough space
for the minimum length of an icon at runtime.

How to fix this error?

Specify a larger value.

Error message extract from SAP system. Copyright SAP SE.