Main toolbar > Rectangular Selection Region (Selection Region flyout)

The Rectangular Selection Region button, available from the Selection Region flyout, provides one of five methods you can use to select objects by region. The other methods are Circular, Fence, Lasso, and Paint.

You can use Rectangular to select either objects that are completely within the selection region (window method), or objects that are either within or touched by the selection shape (crossing method). Toggle between the window and crossing selection methods by using the Window/Crossing Selection button on the Main toolbar.

Note: If you hold down Ctrl while specifying a region, the affected objects are added to the current selection. Conversely, if you hold down Alt while specifying a region, the affected objects are removed from the current selection.