Foxit PDF Editor provides below two types of display when opening PDFs.
1. Open files in multiple windows
2. Open files in single window
How to do
Here are three ways to set the display as actual requirement.
1. Function setting
Open Editor > File > Preferences > Documents > uncheck/check "Allow multiple instances" as below picture.
2. Registry Editor
Navigate to \HKEY_CURRENT_USER\SOFTWARE\Foxit Software\Foxit PDF Editor xx.0\Preferences \Documents\bMultiInstance
Note: Value 0 : disable multiple windows ;
Value 1 : enable multiple windows.
3. GPO template
Navigate to Preferences > Multiple Instances