1. What investment choices do they give you for the 401K?
2. Do they allow you to set up a brokerage account and pick any mutual fund you wish?
Even if #2 is No, hopefully they at least give you to ability to invest in an equivalent index fund of the stock market — a proxy for the S&P 500.
Mine lets you put it in a self-directed broker account but the choices of mutual funds are restricted, all the mutual funds that they allow you to select are all ESG funds.
This is good advice. Check for a Nasdaq index fund too. Maybe small cap large cap etc
Companies have become more resistant to number 2. People lost too much money doing their own thing. My company whacked this option not long after I left