Foxit PDF Editor/Foxit PDF Reader Provides two ways for you to open PDFs in multiple Foxit Windows. Following is an introduction to these two methods.
Please go to File tab in Foxit PDF Reader> Preferences > Documents > Open Setting > check "Allow Multiple Instances" or "Always open files in a new window", click on OK button to enable single document interface mode in Foxit PDF Editor/Reader. This setting will enable Foxit PDF Editor/Reader to create a new separate window when double-click to open a PDF file.
Note: The option “Open in multiple instances” has been updated to “Always open files in a new window" since version 13.0 and Version 2023.2.
When you open some PDF files in multiple tabs in a single Foxit PDF Editor/Reader window, please drag and drop a file tab outside of the existing window to create a new instance and view the PDF file in that individual window.
Note: This tear a tab out method is available in Foxit PDF Editor/Reader 9.4 and higher versions.