Qt QTableWidget Column resizing

1. Change the ResizeMode of the QHeaderView. For example, use:

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horizontalHeader()->setResizeMode( 0, QHeaderView::Stretch );

to make the first column resize so the QTableWidget is always full.

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2. Override the resizeEvent and set the widths of each column yourself when the QTableWidget has been resized.

1. To stretch last column:

   ui->tableWidget->horizontalHeader()->setStretchLastSection(true);
   

2. To stretch column #n:

   ui->tableWidget->horizontalHeader()->setSectionResizeMode(n, QHeaderView::Stretch);
   

The best solution for this, in Qt5 you have to use setSectionResizeMode instead of setResizeMode

tabv = QTableView()
tabv.horizontalHeader().setSectionResizeMode(QHeaderView::Stretch)

Also you can specify the Stretch mode when resizing

tabv.horizontalHeader().resizeSections(QHeaderView::Stretch)