Adding sixteenth notes between eighth notes

Can someone please tell me how to notate sixteenth notes in the treble clef that are IN-BETWEEN running eighth notes in the base? MuseScore wants to always line them up so they sound simultaneously, rather than consecutively. See attached showing how MuseScore lines up the notes above and below. I have made multiple attempts to figure this out without luck.. I am using MuseScore 4.
Thanks in advance!