Search engine chooser is switching between horizontal and vertical

I have several search engine manually added. One is google, one is youtube, one is wiki, you know the drill.

By months now it switching from being superior horizontal (type and click on of icons below to search) to clunky vertical (dropdown menu that require more clicks and not as gazable).

It seems like developers can't decide and toggle it every other update. I want vertical option permanently. I've tried to google it, but only found ancient threads from years ago.

Is there like string in about:config to help me or a plugin?