How do I write an arpeggio spanning several staves (piano)?

Jun 19, 2019

Question is in the subject, really. Unless my English fails me _again_ and those are not staves I'm talking about.

Anyway, I have a series of 5 notes, three of which are in the bass clef and the two others in the treble clef; and they are meant to be played as an arpeggio.

I have input the scores separately on both staves, at the same beat, but I do not see how I can make the arpeggio extend from the bass clef to the treble clef, or the reverse. I have tried shortcuts which I thought were obvious (for instance, selecting the arpeggio sign and pressing Ctrl plus up or down arrow) but no luck.

How do I do this?