I am trying to: create 3 columns in 1 row with the Layouts editor.
I expected to see: content organized in 3 columns of the same 1 row, each column taking up 33% of screen's width.
Instead, I got: content organized in 1 column of 3 different rows, each taking up 100% of screen's width.
The problem appears to be independent of the layout cell type.
Oddly enough, the same problem occurs when I try to make the 3 columns with the Grid of cells.
Even if I wrap each grid into <div class="col-xs-4 col-sm-4 col-md-4 col-lg-4"></div> or if I give the cells the col-xs-4 col-sm-4 col-md-4 col-lg-4 classes, it does nothing.
Is it possible that when Layouts removes my header and replaces it with a parent layout, it doesn't include the bootstrap CSS?