Grups de notes entre pentagrames

In piano scores it is common to use both staves (bass and treble clef) to write a musical phrase.
This can be entered in MuseScore as follows:

First enter all notes in one staff:

Ctrl+Shift+Down moves the selected note or chord to the next staff (Mac: ⌘+Shift+Down.)

See also: Bar line for cross-staff bar lines (i.e. grand staff).