How do I modify global layout boxes setting?

[ezagent]

Admin | Tools | Layout Boxes Controller | Edit Box

Sorry, if this question has been answered elsewhere, if so, clue me in.

The single column setting is wicked confusing. It took me over an hour to figure out the purpose of the single column setting. I tried experimenting, the wiki and the forum.

I've concluded that the Single Column options in the Edit Box are used to control the header search form, and irrelevant in every other instance. I've gone to a left column display and turned off the header search, the wrapper on my site has search, for the cart I'll put search in the sidebar.

Finally... here's my question. Where do I modify the edit box? I want to use strikeout on the Single Column option to communicate the uselessness of this option to my users.