Question

I have dragged and dropped a widget within a parent widget in the designer within qt creator.

It has an arbitrary fixed position rectangle within its parent.

I want to modify it such that it will conform to its parents dimensions. That is it should be “maximized” within its parent.

What button in the designer do I press to do this?

Answer 1

This is what layouts are for. See this for an explanation.

I’m not particularly familiar with Qt Designer, but the general process is to create a layout (QHBoxLayout would work for you) for the parent widget, and add the child widget to that layout.

Another thing to consider is that, in your case, you could simply set the child widget to be the central widget of the QMainWindow:

this->setCentralWidget(theMaximizedWidget);