Andrew,
On behalf of user Kmeelo

Polygonal Area adds measurements text with 12 decimal digits and then as short as possible.

Current formatting path see: https://www.qcad.org/rsforum/viewtopic.php?f=32&t=10450&p=42833#p42805

Related forum feature request: https://www.qcad.org/rsforum/viewtopic.php?f=31&t=10458

I also see a misconception of the term 'precision'.
Numbers precision is the amount of significant digits disregarding the position of the decimal point.
12 decimal digits is about the largest precision for numbers with 5 integer digits.

Regards,
CVH