When you create Dashboard layout or Flexible Panel Component, a message box will guide you to select column template.

Select the preferred layout from the template and click OK.
This setting can be changed afterwards.

Selected template layout for Flexible Panel will appear on the screen.

If you clicked Cancel before selecting the template, you can choose Flexible Panel from the Component Pane to create the page layout.
Flexible Panels can be nest positioned.

Layout can be changed from Flexible panel property setting (set Layout).
The number of columns and their width can be changed. Width can be split by multiples of 1/12 size of the full screen.
(e.g.: 3 columns can be set 2/12, 8/12, 2/12)

　

Delete or split the column to change the number of columns.
The column width can be changed by dragging the blue colored border of the column.

Component placed in the column area is displayed as gray colored square.
You can check its location and the number of components within the column.

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