@BrantFF said in How to set QProgressBar widget in vertically from Qt Designer?:
It will return to default value( here is Horizontal ) when I change other attributes.
Give an example of exactly one further change which causes Vertical to get replaced by Horizontal. And if it really does that the version of Qt Creator you are using. OIC, Qt Designer: v6.5.0. Give the change example (e.g. does it happen if you uncheck textVisible? does it change if you pick some other widget and change one of its attributes, so that you are saying any change at all causes reversion?) and ask someone with that Designer version if it happens to them.