Not sure where you live, poll workers are generally from the districts they work.... And while I have no doubt that inner city and urban districts poll workers are heavily democrat, just like their districts... so too are other districts more weighted republican.
If you want to be a poll worker then sign up, believe me, they nearly always need more.
My district is slightly more republican than democrat and our poll workers are fairly evenly split as well... but if you have more democrats than republicans in your district as poll workers, its likely because those are the folks who signed up....
Now, different states do things differently, my experience is in a suburb of a city in PA.
The typical poll workers party affiliation really doesn’t matter much... all the poll workers do is check in the person verify they are in the book and put them on the machine, and if not in the book check to see if its a mistake with county... and if someone is ADAMANT about voting even if they can’t be confirmed they are given a provisional ballot.
If you suspect hanky panky going on at your polling place, report its. I am not naive, I am sure there is hanky panky going on, but really the poll workers, aren’t your biggest problem with fraud and other issues.
If you want to work/volunteer at the polls then sign up and do it. It’s one day, twice a year generally at most. Its a long day, typical polling work day for me is 6am to 9pm.. Bigger districts may be longer.
Nonetheless, my fellow workers are overwhelmingly teachers and city workers with only a couple of token Republicans.
In the last election I was told that mail-in ballots were counted by a "different group" proving the fix was in!