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One way to ensure that the ListView columns occupy the entire screen when the window is maximized is to handle the SizeChanged event of the form and set the width of each column to a fraction of the width of the ListView control:

private void Form1_SizeChanged(object sender, EventArgs e)
{
    // Calculate the width of each column as a fraction of the ListView width
    int numColumns = listView1.Columns.Count;
    int columnWidth = listView1.Width / numColumns;

    // Set the width of each column to the calculated value
    foreach (ColumnHeader column in listView1.Columns)
    {
        column.Width = columnWidth;
    }
}

In this code, we first calculate the width of each column as a fraction of the ListView width. We then loop through each column and set its width to the calculated value. This ensures that the columns are evenly sized and fill the available space when the window is resized or maximized.

Note: This code assumes that the ListView control is docked to fill the parent form. If the ListView control is anchored or resized in a different way, you may need to adjust the code accordingly.