Can't access second column in writer

I want to make one line that has text left- and right-aligned. I figured I should be able to do this by making two columns. I did that for the line in question, but now I can’t even get the text cursor into the second column. I can see the formatting corner brackets marking the column, but I have no way to get any content into it. What am I missing? Or, is there a more straightforward way to get left- and right-aligned text on the same line?

You could use a table:

one row · two columns, alignment left/right · no borders · no spacing to contents.

I figured out that I can add a manual column break that lets me get into the other column, but that seems like a pretty kludgy way to do it.