pickup measure

Hello,
1) In the New score Wizard, there is a step to choose it:
https://musescore.org/en/handbook/create-new-score#time-signature-picku…

2) If the score is already created, by changing the Actual duration of the first measure (In measure properties):
See: https://musescore.org/en/handbook/measure-operations#duration,
and https://musescore.org/en/handbook/measure-operations#properties

Example for case2:

Before: pickup.mscz
After (1/4 pickup): pickup1.mscz