Create a new notepad, paste the following code, save and rename the suffix to reg, then right-click on the target folder and the option to delete SVN appears.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN]
@="deleteSVN"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN\command]
@="cmd.exe /c \"TITLE Removing SVN Folders in %1 && COLOR 9A && FOR /r \"%1\" %%f IN (.svn) DO RD /s /q \"%%f\" \""
Select the option in the right-click menu to cancel the association of SVN in the folder.
To remove this option, you can save the following content as a reg file and import it.
Windows Registry Editor Version 5.00
[-HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Folder\shell\DeleteSVN]