how to change form-builder to multiple column?

[zltqzj]

the region on the left only has one column ,I want to change it to multiple column,in other words,in order to put view horizontally. I don't have resolutions.Please give me some ideas.thanks.

[zltqzj]

oh ,no,no,I would like left view become horizontally....也就是把控件拖到左边的区域能够横着排列。

[zltqzj]

however,layouit for bootstrap 3 doesn't open source code.
I can only check out its version by bootstrap 2.