In general, we control the switching of views between open documents by Ctrl+Tab/Ctrl+Shift+Tab in multi-tab reading. According to the order of documents they appear in the application window, Ctrl + Tab represents right handover, Ctrl + Shift + Tab represents left handover. Since Foxit PhantomPDF V9.5, we have added two new options under General tab in Preference window for controlling how to switch tabs:
Use recent order when switching tabs with Ctrl+Tab
Quickly switch between tabs by using mouse wheel
With the option Quickly switch between tabs by using mouse wheel checked, you would be able to quickly switch through tabs by pressing mouse wheel. Scroll up to the previous tab, and down to the next tab.
With the option Use recent order when switching tabs with Ctrl+Tab checked, then the switch tab with Ctrl + Tab will be done according to the recent browsing order. Ctrl + Tab represents the switch to the previous active document and Ctrl + Shift + Tab represents the backward switch. For example, I open the document from left to right in the order of 1,2,3,4, when I click on document 1,3,4,2, the current view shows document 2, press Ctrl+Tab switch order is 4,3,1,2,4,3....