A service that simplifies device provisioning and setup for end users, enabling zero-touch deployment
Microsoft’s current official Autopilot support documentation is quite explicit about this.
For an end user, Microsoft lists the support path as: End-user > Contact the IT administrator or the Channel Partner/OEM. If this was registered by Dell initially via Partner Center, there's a chance they might be able to remove it for you.
Otherwise, you would have to reinstall as Home edition in order to prevent the autopilot feature to kick in. If the computer doesn't have an OEM license onboard to support Home edition activate, you would have to get your own license.
I will share the installation instructions anyway.
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After you make the installation media,
On a different computer, launch the Notepad app and place the following in the file:
[EditionID] Core
[Channel] Retail
Then choose Save As and choose file type "all ..", then save it as EI.cfg in the file name field. And then place this file in your flash drive under the \Sources folder in the installation flash drive.
Then new another file in Notepad, and put this in the file:
[PID] Value=YTMG3-N6DKC-DKB77-7M9GH-8HVX7
And now save it as PID.txt file. No need to do the Save as this time. Put in in the same folder.
Then use this flash drive to do a clean install.