No, the Exercise screen is locked in the orientation when it is first started, and cannot be changed. If you want to change the orientation of the Exercise screen, go back to the Main UI screen, rotate the device to the desired orientation and then start the Exercise.
The app cannot distinguish between dragging a digit, or the intention to call up the context menu. To call up the context menu, we recommend you to long touch on the digits on the operands, because they cannot be dragged.
