How to prevent additions to Chrome search engines (not just default)

This question is not about how to protect the default search engine in Chrome (which is, unfortunately, the only advice I can find when I try to search for the answer to this).

I use and edit the full list of Chrome search engines regularly:

chrome://settings/searchEngines

When I go to the list, there are usually many search engines added for sites that I have visited, but have not added to the list, and I regularly have to clean this list out. I don't know if the site is adding itself to the list or if Chrome is making some executive decision for me for sites that I visit regularly, but I'd like to keep it from happening.

Is there a way to only allow manual additions to the search engines list?

Solution 1:

There is an extension that prevents additions to the list:

Don't Add Custom Search

Unfortunately, Chrome doesn't appear to offer a built-in way to disable this.

"You can't disable this feature. Google wanted to make things simple so that users don't have to manually add search engines. Power users might not like this feature, but there's no way to disable it."

Source: Google Chrome Help Forum : How do I disable automatic add of new search engines?