At the top of the screen, you have rotation buttons. It is easy to spot. But, did you know that

  • [F5], [F6], [F7] and [F8] are keyboard shortcuts for those buttons?
  • If you select many cards in the spreadsheet, the rotations can be applied to all selected cards?

In the following animation, I select first six cards then I click [F6] to rotate their front image 90 degrees right:

It's also possible do use the same shortcut when you are in the card location screen.