With the command View | group Window | Full Screen 
, you can switch to the full screen view in which the program uses the entire screen to display the document. FlexiPDF enlarges its program window to the full screen size.
To exit this view mode, press the Esc key. Alternatively, use the key combination Ctrl+F10 to switch between full screen view and normal view at any time.
Switching between open documents
Switching between document tabs is also possible in full-screen mode if multiple tabs are open in the same program window (see also Working with multiple documents). Use the following key combinations, for example:
Ctrl+F6 switches to the next tab
Ctrl+Shift+F6 switches to the previous tab