To change the width of a column, move the mouse over the column border in the header row to see the cursor change to a double-sided arrow. Then click and drag the border to resize the column.

To autosize concrete column, move the mouse over the column border in the header row to see the cursor change to a double-sided arrow and double-click on on the border.
Right-clicking on any column header displays the list of columns available in the panel. Only columns that have checkmarks against them are visible.

To display a column, click on its title in the list to place a checkmark against it. To hide a column, click on its title in the list and the checkmark will disappear.
You can rearrange columns in tables by moving them to new locations. Click on a column header and drag the column to the new location in the table.