Impossible to create a new folder

If you are running macOS 10.15 Catalina, then you cannot write to the root of the drive as it is now a protected read-only system volume.

https://support.apple.com/en-us/HT210650

heworld wrote:

Hello,

I tried to create a new folder but then finder ask me by surprise for my password,

https://discussions.apple.com/content/attachment/a3b32e97-8ab9-4f18-81cd-e4148eb46872

when completed,

finder refuse to create "a new empty folder" because "I do not have the necessary permission", I am the only user of this Mac, I am admin.

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https://discussions.apple.com/content/attachment/d2aa80e2-0655-4997-81fa-390e1bcc80ee

How can I create a new folder again ?

Thank you so much if you know how deal with this it would be very helpful :)

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Resolve issues caused by changing the permissions of items ...