Permanently disable syntax highlighting in Notepad++ for all file types

I am trying to persistently turn off all syntax highlighting for all document types at all times. I understand that I can go to the menu and select "Language > None (Normal Text)" each time I open a file but that is a pain to do every time since it is not remembered. I have disabled all languages in the preference window (Settings > Preferences > Languages) but it still continues to recognize and highlight the syntax for my files. I don’t think this has always been the behavior but I don’t know how to stop it. Thanks for any help.

Notepad++ preferences window showing no languages selected

Notepad++ .ps1 document open showing PowerShell syntax highlighting despite disabling all languages