"To make an observation about" means to carefully notice and comment on a particular detail or aspect of something, often with the intent to analyze or understand it better, such as when they make an observation about behavior.
The phrase "to make an observation about" combines the verb 'make,' meaning to create or perform, with 'observation,' derived from the Latin 'observatio,' meaning 'a watching or noting.' The phrase reflects the act of actively noticing and commenting on something.