On the thumbnail view, you can resize the grid to your needs just by clicking the middle mouse button and dragging around. On most systems you can emulate the middle mouse button by left and right clicking at the same time. -- Tip contributed by Rafael Beccar
Na vista das miniaturas, pode mudar o tamaño da grella premendo o botón central do rato e arrastrándoo. Na maioría dos sistemas poderá emular este botón premendo o esquerdo e o dereito á vez. -- Suxestión fornecida por Rafael Beccar