Documentation tool window
When you use Ctrl+Q (View | Quick Documentation), the Documentation popup is shown.
Then, if you click in the upper-right corner of the popup, the popup transforms into a tool window. As a result, the tool window becomes available in the View | Tool Windows menu.
To turn the tool window back into a popup, click again.
Left or Right
|Switch to the previous or next documentation page (e.g. after using hyperlinks).|
Switch to the item (e.g. source) that corresponds to the documentation page currently shown.
Click this icon to perform the following settings: