Ballots are sent to registered voters in the mail. They can either be mailed back or dropped off in voting boxes that are scattered around. Compared to other states, it’s relatively uncommon to see large groups congregating on Election Day.
Are you sure about that? The Secretary of State website makes it seem like they need to be requested:
"Any registered voter may vote using a vote-by-mail ballot instead of going to the polls on Election Day. To request a vote-by-mail ballot for a single election or to request a vote-by-mail ballot for all elections (permanent vote-by-mail voting), follow the simple process described below."
Edit: This article suggests that ballots get mailed but that there are still physical polling places https://www.msn.com/en-us/news/politics/sluggish-mail-ballot...