I would keep it there if the fees are as low as you can get them, compare them with Vanguard and Fidelity. For reference, one basis point (.01%) on 1.2M is costing you $120 a year.
Keeping assets in a 401k means that ERISA laws apply to that account and give you extra protection against lawsuits, over taxable and even IRA accounts, and what is at risk if you are liable for any damages. Of course you should also have umbrella insurance if you have significant assets to protect.