There is an admissions office at each school. Some are more helpful than others.
UCSB’s admissions office has posted some good videos online.
Below is the program they would show you attended an admissions presentation on campus. At the 24 min mark they talk about general UC admissions. At the 28 min mark they reference pandemic related P/NP classes.
There are many more videos on the UCSB Admissions YouTube Channel. If you scroll to the bottom, you’ll find several videos for HS counselors. They are long but you might find them helpful as well.