opera://settings/searchEngines?search=motor

there you can add:

https://yandex.com/search?text=%s

@leocg I've done it before but I think it shouldn't be like this. Although in total I realized now writing this post that Opera is Chromium after all...

@o0neill Never really thought about it. At a first glance, I see no problems but since I don't work for Opera nor I have decision powers, I guess it doesn't really matter,

@strikker Go to the page and do a long tap on the search field.

You are accidentally pressing F1 when on your desktop.

@ardj Or the author.