Lightning On Chain Wallet – How do I get my Bitcoin back out

I’ve setup a Lightning Network Node. Funded the wallet. Played with channels and sent a few payments back and forth with a mobile wallet. I recorded all the pass phrases when I make the Lightning wallet on the Lightning node. But it didn’t seem the private key was exposed to me while I set things up.

I’ve closed the channels and all my Bitcoin is now back in my on chain LND wallet. How do I extract the Bitcoin out and send to my normal Bitcoin wallet.

Right now I’m beginning to wonder if Bitcoin moved to lightning network has to stay in the lightning network.

Can anyone “validate” if that is the case?

Thank you for your time and knowledge!!