Why is library folder not hidden when i double click on Mcintosh HD icon?

When i double click on the HD icon in the desktop I can see the Library folder as well as an opt folder

Something has apparently changed the invisibility settings. This sometimes happens during a system upgrade. It's merely an appearance issue. If you wish you can make the folders invisible using the Terminal:
sudo chflags hidden /opt
Press RETURN. Enter your admin password when prompted and press RETURN again.
The Library folder is supposed to be visible along with the Applications, System, and Users folders.
The only invisible Library folder is the one located in your Home folder.

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