Changed name of computer then computer icon appeared on desktop ?

Hello,

I changed the name of my computer and now, I have an icon on my desktop with "my new name" in it. When I 'open' it, it shows me the space of my hard drive (114Go for a 512Go overall MacBook Air? Is this normal?) with folders (applications, library, system, users)

How do I get rid of it ? I can't find any help online.

Thank you very much for anyone who will help :)

Have a nice day,