How to restore one-off search behaviour in the search bar in Firefox 149?

Firefox recently updated to version 149 and now it is missing the one-off search buttons that can be seen at the bottom here:

Firefox search bar - the bottom reads "This time, search with:" and lists several different options to search with, different from the default search engine.

(image from the Mozilla Support pages)

Instead, the search bar now has a dropdown on the left side which looks like this when collapsed:

Firefox search bar in version 149 - there is a dropdown menu on the left which shows the icon of the current search engine.

And when expanded looks like so:

Firefox search bar in version 149 - the dropdown on the left side is expanded and shows the icons and names of different search engines.

However, this is a sticky choice and will persist for the next search. I want to use a one-off behaviour because most times I search using the same engine and I do not want to reset my preference between searches. How can this be achieved?