If you are a PRO version user you can enter full-screen mode of SWF & FLV Player. Go to “Movie” menu item and choose “Enter full-screen mode“.
To exit full-screen mode right-click anywhere in the Viewer and choose the corresponding option from context menu. You may also use hot key (ctrl+F) to exit full-screen mode.
You can hide movie controls by choosing Movie –> “Hide controls in full-screen” option. Alternatively, choose “Hide control panel in fullscreen mode” option in Preferences.
Read as well how to Float on top in “Customize Movie Viewer” section.