Photoshop :: Close-up Tool

the close-up tool, which by default used a (+) sign to amplify detail, switched to a (-) sign to show detail further away from the viewer. That's the magnifyin glass icon. It must have happened when using the Alt key.

But the (-) mode became permanent and there was no way to change it back to (+), even after re-setting tools, and even after uninstall re-install.

It took uninstall and deleted a subdirectory and its contents, where P.S. stores user parameters, that it installed as (+) which is the default mode.