Figure 1.17 - Toolbar options
If you click and hold the "Select Box" icon, you will expand the button to
display all options related selection.
With the select circle, you will be able to "paint" a selection by click and
dragging the small circle that will appear on your screen. The lasso
enables you to draw a shape that adds all objects inside to the selection.
Info: A significant aspect of the selection shortcuts is that you can use
them in all editors. The same keys work regardless of the Editor you
have at the moment.
1.6 The 3D Cursor