Keep Safe Search OFF in IE11 & Chromium Edge Permanently

FlyerEd said:

Bottom line is that I still don't have a way to keep "Safe Search" permanently 'OFF', as well as, "Search Suggestions" ... VERY FRUSTRATING!

Both of these settings (filtering and suggestions) are managed by search engine and not anywhere in Windows or web browser.
I think you need to log in to search engine that you use and adjust your preferences there.

Your preferences can be saved either into a cookie or on search engine server, which depends on whether you log into search engine or not.
Not logging in means you must not delete a cookie as already explained, otherwise you need to log in each time (if you don't get logged in automatically)

FlyerEd said:

Obviously, Bing's menu is where I have to go to turn Safe Search OFF, as well as, uncheck Use Search Suggestions. Safe Search is OFF in Start Menu Settings, and both Safe Search and Search Suggestions are set to be off in the registry. I have no idea what else to do to keep both OFF permanently. Logically you would think if you turn Safe Search OFF in Start Settings that would work, but it doesn't …

There are 2 search services that you confuse:
1. Windows Search
2. Search engine search

Both of these service have "Safe search" option, but they are unrelated to each other in such a way that one does not affect the other.
Setting safe search in Windows (start menu) to OFF does not mean safe search in bing must also be OFF.

"Safe search" in Windows search does not apply to your browser, instead it applies to web previews when you use search function in Windows task bar / start menu, this can be powered either with or without cortana, but it has nothing to do with browsing web with web browser.

On another side "Safe search" in Bing (search engine) applies only when you surf the web using what ever web browser you happen to have.

Keep in mind if you open web page by using Windows search in web browser you'll be affected by both settings, but not in same time obviously.

"Search Suggestions" apply only to Bing (or any other search engine), but does not apply to "Windows search", in Windows search this feature is called "Cloud content search" which can in addition be powered with locally stored data to improve search performance (because cloud would be less accessed)

Do you see the difference?
Windows search is one thing, Bing search is another thing, each of them has their own options independent of each other.

The only thing they have in common is the name of this option because these options share same functionality, but are not the same thing, because each applies to separate search service.

RE: Edge Chromium.

Just set it to never clear Bing cookies. Then don't run any sort of system cleaner that might clear the cookies without whitelisting them.

Well just to add that since Bing uses cookies to store safe search preferences and the OP cannot figure that out then on those occasions when "safe search off" is required maybe use a search engine that stores those settings in it's bookmark.

So bookmark these pages for example:

Qwant

Startpage.com - The world's most private search engine