Change the layout direction of a flexbox element from horizontal to vertical.
Flexbox is a display setting found in the styles tab under Layout > Display Settings
Click to select Column 1 which is the white box that this paragraph you're reading is currently inside of.
Now that Column 1 is selected, press the up arrow on your keyboard, selecting the parent element: Column Wrap 1
With Column Wrap 1 selected, click the icon shown above in the Layout > Flex Layout styles panel.