Hi,
I'm Rodrigo and I'll help you.
Open the task manager > Services tab > Open Services > Locate "Windows Update" on the list, right-click it, and select "Stop" (if it is greyed out, it is already stopped).
Go to C:\Windows\SoftwareDistribution\Download and delete all files inside the folder.
Restart the computer. (Not "Update and restart")
This will remove the Windows 11 update files and it will return to only offer the Windows 11 upgrade.