Since version 11.1 of Foxit PDF Editor for Mac/Foxit PDF Reader for Mac, you are able to open all PDF files with navigation panels hidden by doing as follows:
1. Go to "File"menu in Foxit PDF Editor/Foxit PDF Reader > "Preferences" > "History" > uncheck"Restore last view settings when reopening" > click"OK"to save the setting.
2. Open any PDF file, press"F4" in Foxit PDF Editor/Foxit PDF Reader to hide the navigation panels. Then all of the other PDF files that you open next time will be opened with navigation panels hidden.