How to have different text shown in figure caption and in outline?

[flokl]

As an alternative, you can fully customize the text that will be shown in the outline with the following code which is taken from the Typst Examples Book.

#let in-outline = state("in-outline", false)
#show outline: it => {
  in-outline.update(true)
  it
  in-outline.update(false)
}

#let flex-caption(long, short) = context if in-outline.get() { short } else { long }

// And this is in the document.
#outline(title: [Figures], target: figure)

#figure(
  rect(),
  caption: flex-caption(
    [This is my long caption text in the document.],
    [This is short],
  )
)

Output