I have Foxit Reader 6.0.3.0524 on a Windows Vista Premium.
I have read this question (How to open two independent instances of Foxit Reader). I have set Foxit to 'allow multiple instances'. (Edit -> Preferences -> Documents -> Allow multiple instances) However, I am not able to see the two files side-by-side. They open in two tabs (one in each tab). In addition to the 'allow multiple instances' setting, what do I need to do to view the two files side by side so that I don't have to keep clicking on the tabs.