In QT Designer, how to center a widget in a horizontal layout?

[Mizmas]

For example the QLineEdit in the middle is off center because there's a QLabel to the left, but I want the line edit to be in the middle:

Or here I want the "MIDI Output Mode" widget in the middle as well, but since the other widgets are different sized, it gets placed off center:

In both examples the widgets are in a QFrame which has the horizontal layout applied to it.

[ChrisW67]

A grid layout with column stretch factors '1,1,1'. The label right-align in the left cell, the edit in the centre cell, and a spacer or other widget in the right cell.

[Mizmas]

@ChrisW67 It works, but I was hoping there was a more intuitive way :D