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the quick and expert mode work but guided mode screen effects window missing
reset preferences ; deleted preferences -- nothing is working
Please navigate to "/Library/Application Support/Adobe/Photoshop Elements/16.0" and delete the ThumbDatabase.db3 file.
Then navigate to "/Library/Application Support/Adobe/Photoshop Elements/16.0/Locale/en_US/" and delete the MediaDatabase.db3 file
(I'm assuming you're using the English version. If you're using some other version, please select the appropriate language sub-folder within the Locale folder)
Now relaunch the application.
Let me know if this resolves the issue.