Add an icon on the Design Tab for nonstandard layouts
On behalf of the Kentico PM team, I want to say thank you for sharing your idea with us and the ever-growing Kentico community.
As this ideas has not been active for past months and it doesn’t fit our product vision, I’ve had to make the tough decision to close this post.
But we still need you! Continue sending your ideas to us, after all nobody knows what is needed more than the users.
Chris Bass commented
Currently, the workaround is to simply create multiple web parts, because developers don't think to go check the layout before working on updating a web part's code.