Accessing router webfig through public IP from Lan

Hi All,

I’m new to Mikrotik routers, and I have a Hex one, my question is certainly stupid but I’d like to know if it’s normal that I can access the webfig page when I type my external address from inside my network ?

And I also would like to know if the default configuration that is automatically applied at the first start is secure enough ?

Thanks
Jack