We know that expert chess players look at chess boards differently from novices, focusing on the most important areas; this paper shows how expert teachers do the same.
How experts look (see?) is based on their knowledge of what might happen next:
…experts can ignore irrelevant information to focus on what matters.
Wolff, C., Jarodzka, H., van den Bogert, N. and Boshuizen, H. (2016). Teacher vision: expert and novice teachers’ perception of problematic classroom management scenes. Instructional Science 44(243) https://doi.org/10.1007/s11251-016-9367-z