On a Windows 11 computer with 2 mice, 2 keyboards, and 2 displays and keyboards have been paired. While running in Native mode I opened 2 instances of LibreOffice Writer, one in each display. Then change to Multiplex mode. User 1 selects one instance of Writer and begins to type which works. User 2 selects the second instance and begins to type but it types in the first instance rather than the second one.

I tried the same thing with Notepad and each user can work independently on the two instances.

I had similar issues that LibreOffice Writer had when if I try having 2 users use two instance of Google Chrome. The keystrokes from both keyboards go to one browser window.

Are there any settings I need to change to allow multiple users to use multiple instances of the same program.