Answer
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.
- Make Allow Multiple Instances/Always open files in a new window option checked in Preferences
- Tear a tab out to become a new window
Please go to File tab in Foxit PDF Reader> Preferences > Documents > Open Setting > check "Allow Multiple Instances" , "Always open files in a new window" or "always open files in a new window/in a new instance", 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: Starting from version 13.0 and version 2023.2, the option “Open in multiple instances” has been updated to “Always open files in a new window".
Beginning with version 14.0 and version 2025.2, users can choose between “Open in multiple instances” and “Always open files in a new window” through the updated option "Always open files in a new window or in a new instance." This provides flexibility for users to decide their preferred behavior when opening files.
New window: Open each file in a new window (within the same application process).
New instance: Open each file in a fully separate application instance (independent process).
Tear a tab out to become a new window
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.