The GeoGebra toolbar is used for constructing and exploring geometric objects. The tools are categorized into twelve as shown below. In each category, the default tool is displayed. For example, in the Special Line tools, the Perpendicular line is the default tool.
More tools in each category can be displayed by clicking the triangle at the bottom-right of the toolbar buttons. Once the list of tools is displayed, the user can select a tool by clicking it. The icon of the selected tool will then be displayed on the toolbar.
During construction, the selected tool is highlighted by the blue border as shown in both figures. To deselect a tool, you can click the Move tool or press the Esc key on your keyboard.