Basically you have two different ways of influencing how columns are displayed: either using <Grid adjustment> or via the form view .
Click on the <Grid adjustment> button and check the columns (under 'Active') that you wish to display.
From the form view
Move the cursor in the form view to the desired item until a four-headed arrow is displayed. You can now use drag&drop to drag this item into the grid view, where it will be displayed as a column.
If you wish to hide the column, hold the <CTRL> key pressed and drag it from the grid view at the top to the form view at the bottom.