Thank you. I have the activity monitor open, but it is not clear what the " process(es) associated with EaseUS Data Recovery Wizard" are so that I can quit them. I do not see the program MplayerX in the list of programs in the activity monitor.
This is the instruction on the website you sent " Open Activity Monitor in the Utilities folder in Launchpad, and
select All Processes on the drop-down menu at the top of the window.
Select the process(es) associated with EaseUS Data Recovery Wizard in
the list, click Quit Process icon in the left corner of the window, and
click Quit in the pop-up dialog box (if that doesn’t work, then try
Force Quit)."