Basically, the workspace in IntelliJ IDEA consists of the main editor with tabs, menus, and many tool windows.
The tool windows are hidden, by default, in Version 13 and later of IDEA. You can toggle them on and off using the button in the bottom-left corner of the screen:
Tool windows are those little "tabs" visible at the edges of the workspace. These edges are called tool window bars, as shown in the following screenshot:
Some of the tool windows are always available, such as Project or Structure, while some ...