As a retired teacher, I can remember when I was observed by the building principal or assistant principal.
Most of the time, those observations came with advanced notification. After a few years, those became very easy. Plan a good lesson and implement it for the boss.
Sometimes, however, the principal dropped in on a class in an unexpected fashion. Those were quite a bit more stressful.
Are you doing your job on a consistent basis, or just when someone’s watching?