Setting the double repeat default for volte
There are different double repeat styles for volte that can be selected using the context property doubleRepeatBarType.
\version "2.24"
\relative c'' {
\repeat volta 2 { c1 }
\set Score.doubleRepeatBarType = ":..:"
\repeat volta 2 { c1 }
\set Score.doubleRepeatBarType = ":|.|:"
\repeat volta 2 { c1 }
\set Score.doubleRepeatBarType = ":|.:"
\repeat volta 2 { c1 }
}