Based on the UC Davis 4 year plan, the first 2 CS programming classes for Spring 2023 shows the following enrollment maximums.
ECS32: 75 maximum enrollment
ECS36: 50 maximum enrollment
Where you will see large classes will be in the General Education requirements and required major foundation classes like Calculus, Physics.
My son’s largest class was about 100 for a Cultural Anthropology class lecture but also had a smaller 20 student discussion group component.