How do I squash a widget in a grid layout down to the bottom to its minimum size?

[ChrisW67]

The layout allocates the available space between the widgets that want it. If you place nothing in rows 1-5 of the grid then there is nothing to occupy space there, so the two actual widgets get the space. You have a range of options: set a maximum height on the custom widget, setRowStretch() to 1 for all rows except the last which gets 0, put (expanding) vertical spacers in the empty grid rows. What effect are you trying to achieve with the empty grid squares?

[enjoysmath]

The "empty grid rows" will not be empty they will be occupied by the QGraphicsView. I want a maximized QGraphicsView and a minimized lower custom widget.

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Added after 13 minutes:

Setting the size policy of either subwidget does nothing. Setting the row stretch or setting the rowSpan do nothing either.

[anda_skoa]

So you have two widgets?
Why use a grid layout at all?
Sounds like a QVBoxLayout use case to me.

Cheers,
_