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
A la vista de miniatures, podeu redimensionar la graella a les vostres necessitats clicant el botó del mig del ratolí i arrossegant. A la majoria del sistemes podeu emular el botó del mig del ratolí fent clic als botons dret i esquerre al mateix temps. -- Consell proporcionat per Rafael Beccar