Scope: source (selected) note.
The text tab shows the $Text space of the current note. Dragging the pop-over will result in a 'tear-off' stand-alone window that will persist until the end of the current session (i.e. the document and/or app are closed). A torn-off window may be closed during the current session if no longer needed.
This feature is offered in a richer form by opening a stand-alone text window for a note. Links in $Text are non-functional in this display.
From v11.6.0, Text pane in Get Info has been removed, having been found to be not very useful. This reflects the fact that note text is now often longer and more complex than in the early days of Tinderbox.