To switch the orientation on your Digital Board using a FireTV, first open the Digital Menus App on your Supported Amazon Device.
At the bottom of the Digital Menus landing page you'll see new language that says "Have a vertical display? Once your menu has loaded, press the "Select" button on your remote to rotate 90, 180, or 270 degrees.
Load an active Digital Board and press the "Select" button on the Amazon remote
Select Rotate 0 Degrees, Rotate 90 Degrees, Rotate 180 Degrees, Rotate 270 Degrees, or Cancel to rotate the board to your selected orientation