Imac Catalina Version 10.15.6 - using Microsoft blue tooth mouse. The right click of the mouse no longer functioned - unknown reason. So - I went to Systems Preferences / Mouse / Primary Mouse Button and changed the primary mouse button selection from left to right. I wish to change it back but mouse functions do not work correctly. In 'mouse', the mouse pointer is flashing in the search window. I can not get to the 'left' button to change it back. Suggestions?
