You can easily set the dimensions of a block to more closely resemble landscape mode. First, click on an existing block to select it and then use the Settings tab that will appear on its left border.
For standard page sizes (A4 or 8.5x11), you’ll need to use the custom option to reverse the width and height dimensions. For example, for a letter-sized page, you’ll need to set the width to 11 inches and the height to 8.5 inches. The content on the canvas will never rotate, but the canvas layout will then appear more similar to a landscape layout.
To print in landscape mode, you will need to consult your printer's support regarding how to rotate an image that is horizontal.