Go to Appearance > Engraving Rules (⌘+⇧+E on Mac, Ctrl+Shift+E on PC) > Barlines and, from here, changing the 'Default Barline Type' to Invisible. Press OK and return to your score.
How do you put no Barlines in Sibelius?
Unlike many Sibelius elements which can be hidden using Home > Hide or Show > Hide or Show (Ctrl/Cmd-Shift-H), barlines are hidden by changing the barline type. Select the barline then use Notation > Barlines > Invisible to make the barline invisible.
Is it possible not to use a time signature?
Free time is a type of musical anti-meter free from musical time and time signature. It is used when a piece of music has no discernible beat. Instead, the rhythm is intuitive and free-flowing. ... There is no time signature but the direction 'Free time' is written above the stave.