New Bosch miter saw

The first two pictures are of my saw, and the last two are screenshots from the internet. What is the red circular part? Also, the original saw blade is different from mine.

https://preview.redd.it/lqskfm64g06g1.jpg?width=4080&format=pjpg&auto=webp&s=02740ca48896d6ac9c46e7d04fd2fc1dc954775b

https://preview.redd.it/wu6qdr64g06g1.jpg?width=3072&format=pjpg&auto=webp&s=0de01aec415e98cf17c0faaf77cf0ed9ee0e5f13

https://preview.redd.it/cl9n9o64g06g1.png?width=2244&format=png&auto=webp&s=97ed1451d219d9b87d0f87275d12b2efd50d2690

https://preview.redd.it/fztujn64g06g1.png?width=2244&format=png&auto=webp&s=a67f06a5bfb5c8fdedb68a758a6ff22ee7dacedb