undo omit

[Br. Gabriel-Marie | SSPX]

How do I undo this?

\omit Staff.KeySignature

Say I set it at the start of the score, how do I re-instate it later?

signature = { \time 4/4 \key b \major }
verses = \new Voice = "verses" \relative c' {
    \signature
    fs4 \omit Staff.KeySignature b4 b4 ...
    \break
}

chorus = \new Voice = "chorus" \relative c'' {
    \UNDO THE OMISSION HERE
    \signature

    b4 b4 b4 ...
}