In order some changed settings come into effect, they must be applied. For that, press the “Apply” button on the toolbar. (Fig. 9.1).
Figure 9.1. The Apply button for the changed settings.
Also you can use the opportunity to undo and redo the settings. For that, use the corresponding buttons on the tool bar (Fig.9.2).
Figure 9.2. Undo and redo settings.
