QMainWindow minimum size is much larger than the centralwidget inside it.

[erangre]

It just doesn't automatically become smaller when you hide the frame.
Just resize it manually once after hiding.

Cheers,
_

Thank you for the response. I see I wasn't clear in my statement. By manually, I meant that I had to use the mouse to drag the window size, and I couldn't find any code that would make it smaller. Using the sizehint of the internal QWidget made it a bit smaller, but not nearly the correct size, even though the sizehint of the QWidget is the correct size.

Cheers!