Curves tool: how to reverse the black-white orientation?
For more than 20 years, I have used the curve tool with black in the lower left and white in the upper right. Recently I got a new studio computer and set it up from scratch, rather than migrating data from my previous computer. Thus I did a fresh install of Photoshop 2020. The curve tool is oriented opposite of what I am used to: White is in the lower left corner and black is in the upper right.
How can I reverse the black-white orientation of the curve tool so that black is in the lower left and white is in the upper right?
Occasionally I have seen the curve tool reversed when opening certain files. What causes this?

