Mac Airbook adminstrator can't add files to hard drive

You can no longer store any items on the root of the drive any more because the root of the drive is now on a signed & sealed read-only volume. You can only store files within the "/Users" folder.

See the following Apple article regarding the new drive layouts being used by macOS 10.15+:

Signed system volume security - Apple Support

leebee57 Said:

"[...]I am able to add things to the Users folder. Seems rather inconvenient though."

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Recommend it Comes Back:

Do your Part: Inform Apple of your feedback of this issue. Include how you’ve troubleshot this, and your results. Apple wont get back to you directly, but the more feedback they receive from its users, the more likely they will know what suits their customer prefer, and what to include in macOS versions to come. Apple will know nothing of your ideas, if you don't provide them to them.

1. Go Here: Feedback - macOS - Apple
2. Select: "Feature Request" for the "Applications/Utilities"
3. Select: "User Interface" for the "Feedback Area"
4. Comment: that you want this option and why. Include the URL of this thread.
5. Proceed from there as necessary