There is the possibilit to select "Two Column"-Layout in the Theme Option, but if I select this it will always show "One Column". There is no different between both. What do I have to do to get the "Two Column"-Layout?
on small screens only once column will be displayed. If set to two columns, you'd need at least a width of 1350 pixels to display the posts in two columns. Please try to maximize your browser window and reset the browser zoom (CTRL + 0 on PCs, CMD + 0 on Macs).