The target area is for choosing a target unit and presenting the result.
Nearly all conversions allow to calculate values with a precision up to 1000 digits after the comma.
It is also possible to view the result in a scientific form by checking
the Check box called "SCI":
The textfield "Set significant figures" has been disabled, if the category
you have choosen does not allow processing digits after the comma.
A graphical panel appears dependent on the actual context. For the category
called "Calendar (date)" ...
"Color" ...
and "Spoken Numbers":