This is what worked for me in 2023.
The difficulty arises because Sharepoint Designer has not been updated and is not across Multi Factor Authentication.
Download and install Sharepoint Designer and two updates as follows.
Sharepoint Designer Service Pack One
Then go into your account settings in Sharepoint and get an app password
Use that to switch account in Sharepoint Designer once it is installed.
IMPORTANT: To connect to the site make sure you use https:// prefix
Then in "All files" change the name of the list (it looks like a FOLDER icon) by hovering and changing within the list.
Voila!