Turning custom setting OFF is just half the process
The "Save and Exit" button/control at the very bottom of the settings list will add a settings cookie to your browser.
If you are using Palemoon browser:
Cookies from DDG can be protected (almost) against deleting cookies on session end, by adding to "Exceptions"
(This will not preserve the DDG cookie if "Clear all cookies" is used, "Clear all cookies" does exactly what it says ... !

Otherwise x.15a2's post gives some other preserve settings methods :)
posted by bawldiggle 2 years and 3 months ago Link

Or, just use https:/// and there's nothing to save, configure, etc.
posted by x.15a2 Community Leader2 years and 3 months ago Link