https://www.healthline.com/health-news/vaccinated-people-can...
It is well known that vaccination helps to reduce spread. It isn't perfect, but it is better than being unvaccinated.
The data is clear but you can also reason about this and feel like it is intuitively true - those that are vaccinated face better outcomes and are sick for shorter periods of time, the shorter period of time they are infected leads to them being unable to infect others for as long. It's pretty simple, really.
edit: multiple studies by scientists in different countries is more reliable than marketing text from any specific manufacturer. The data is available, just read the studies mentioned in the article I linked, or research on your own.