Hi and thanks for reaching out. My name is William. I'm a Windows technical expert. I'll be happy to help you out today.
Run appwiz.cpl and uninstall Microsoft Edge. Afterwards, follow below to make the necessary changes the keep Edge Chromium from reinstalling:
Run regedit.exe (you will need to be an admin).
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
Right-click the Microsoft key (folder icon) > select New > select Key > name it EdgeUpdate
Right-click EdgeUpdate > select New > select DWORD 32-bit > name it DoNotUpdateToEdgeWithChromium and assign a value of 1
Alternatively, create a new text document on your desktop and append the name to change the .txt to .reg. Edit the new file and paste the following:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EdgeUpdate]
"DoNotUpdateToEdgeWithChromium "=dword:00000001
Save the file and double-click to import the new setting into the registry.