The Data Selection panel presents a dynamically visible display of tools that can assist the drafting process. Select the pull-down menu Tools | Show Data Selection to open the Data Selection panel.
In the image above we see two views of the Data Selection panel. The controls in the panel change dynamically, depending on the type of command being undertaken. The various tools shown in the Data Selection panel are not used to initiate a new command, but rather to offer advanced assistance once a command has been started.
The Chapter titled Selecting and Filtering Entities, provides an in-depth look at how the Data Selection panel is used. We recommend that you get a handle on the basics before you try your hand at mastering this feature.