Clicking in data sample visible in the window does not add a column break, but selects the column. It would be more intuitive to create columns by clicking not only in the ruler, but in the data area. To select a column, one can click in its header instead.
I can confirm this behaviour. Changing component to ux-advise to decide if it's useful enhancement. When you change this, then for selecting column you have to click on header instead of click into data area.
This should be Status -> NEW for the UX folks :-)
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