Can BSC be added automatically to Metamask

Is there any way BSC can be added automatically to MM. The reason i ask is that i have BSC in MM and i do not remember creating it.

The settings are

Binance Smart Chain Mainnet

i checked the url as others have a different one, but it is one of the 3 recommended by Binance.

The only thing i can think is that it maybe something to do with me looking on uniswap and pancakeswap.

Any input to give me peace of mind would be appreciated.
Thank you