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 go to the next documentation page (for example, after clicking hyperlinks).
On macOS, you can also use the three-finger right-to-left and left-to-right swipe gestures.
Navigate to the source code of the symbol whose documentation is currently open.
Open as Popup Ctrl+Q: show code documentation in a popup instead of the tool window.
Auto-update from Source: when this option is enabled, the content of the tool window changes as you move the mouse pointer in the editor.
If the Show on Mouse Move option is disabled, place the caret at the symbol and press Ctrl+Q to see its documentation in the tool window.
Adjust Font Size: display a slider for changing the font size.
View Mode: by default, the tool window is attached to the edge of the main window and is always visible. You can change the view mode, for example, to make it visible only when active or to detach it from the tool window bar.
Move to: select where to attach the tool window.
Resize: adjust the size of the tool window.
Remove from Sidebar: close the tool window. To reopen it, select from the main menu.
Last modified: 07 April 2022