It's pretty simple. Press the key command for Path/Average. The dialog pops up. Options are Both, Horizontal, or Vertical. The way it used to work was that you could press the cursor key on your keyboard for up, just once and it would land on vertical. Press again for Horizontal. But in 2020, it's different. Press "up" arrow once for Vertical. Press again and it remains on Vertical. Cancel the whole window and start over. Now, instead of pressing the up arrow, press the down arrow once, and it lands on Horizontal. Press again and it stays on Horizontal. So the new functionality is effectively, up arrow for vertical, and down arrow for horizontal. It is no longer to press the up arrow twice to cycle through the options.